Notes on Cambridge palaeontology. IV. Some new Upper Greensand echinoderms / by Harry Seeley.
- Harry Govier Seeley
- Date:
- 1861
Licence: Public Domain Mark
Credit: Notes on Cambridge palaeontology. IV. Some new Upper Greensand echinoderms / by Harry Seeley. Source: Wellcome Collection.
Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.
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![Salenia (? Hyposalenia) Woodwardi. Round, greatly depressed. Ambulacral areas narrow and straight, furnished with two rows of rather small tubercles, which are placed close together and occupy the whole of the space be- tween the pores. The poriferous zones are slightly sinuous, wide, united above and below, and consist of nearly twenty pairs of pores; the pairs are wide apart and oblique. The lower part of each plate is a little impressed, so that the upper ])art projects below the pair of pores of the plate above. Plates nearly quadrate. Interamhulacral areas about three times the width of the ambulacral, furnished with two rows of large tubercles of three in a row, of which the top or middle one is largest. The boss is greatly elevated, hemispherical, and crenulated on the top. The areolae are surrounded, ex- cept towards the poriferous zones on which they abut, by a closely-placed row of secondary tubercles. The small inter- spaces between the double zigzag rows which these form are granulated. The mouth is very slightly pentagonal. The apical disk appears to have been but slightly elevated; its marginal plates scarcely projected above those of the test. The ocular plates have a rather deep spoon-shaped hollow on each side of the ambulacral area. The other plates are not sufficiently preserved for description, but appear to have been ornamented. Lat. ^ inch, alt. inch ; oral opening nearly ^ inch ; apical opening nearly This remarkable little Urchin is so distinct as not to admit of comparison with any known form. , Rare. Coll. Univ. Mus. j Ash well. Hyposalenia may be regarded as a section of Peltastes, and Peltastes and Goniophorus as subgenera of Salenia. Goniophorus lunatus, Ag., var. minutus. A minute inflated Urchin with an elevated disk. Base flat- tened and slightly concave. Apical disk a regular pentagon, broad; its margin considerably elevated: it is divided into six pits, of which the central one is the anus; it is square. The pit immediately in front is also square; all the rest are pentagonal. Each of the five pits is margined by a strong elevated ridge: the three anterior are transversely divided by a septum rather less elevated than the marginal cordon. The genital openings are in the middle of the sides of the penta- gon, at the point where the ridges meet. The madreporic tubercle is visible, and occupies the right half of the right anterior pentagon. The ambulacra are narrow and furnished i;](https://iiif.wellcomecollection.org/image/b22412426_0006.jp2/full/800%2C/0/default.jpg)
