36 



NATURAL HISTORY BULLETIN 



Clypeaster rosaceus 



Echinus rosaceus Linne, 1758. Svst. Nat. ed. 10, p. 665. 

 Clypeaster rosaceus Lamarck, 1801. Srst. Anim. s. Vert., p. 349. 

 EcMnanilius rosaceus A. Agassiz. 1872. Eev. Ech., p. 311; pi. XI d, figs. 

 1 and 2. 



In the " Narrative ", this species is referred to as abundant 

 on the Great Bahama (p. 53) and as ''found in limited num- 

 bers" near Bird Key, Tortugas (p. 133). There are two large 

 specimens in the collection labelled Bahama Banks. May 17, 

 1893. 



Clypeaster subdepressus 



Eclnnanilius suhdepressa Gray, 1825. Ann. PMl., 26. p. 427. 

 Clypeaster subdepressus Agassiz, 1836. Mem. Soc. Sci. Nat. Neuchatel, 1, p. 

 187. A. Agassiz, 1872. Eev. Ech., pi. XI 6. 



No specimen of this large clypeaster is in the collection, but 

 in the "Narrative" (p. 174), Profesor Nutting says that it was 

 dredged on Pourtales Plateau in 60 fms. It may be well to 

 note here that while C. rosaceus and C. suhdepressus are the 

 common West Indian clypeasters, there are now recognized at 

 least foiw other species in the West Indian region. Little how- 

 ever is kno\Mi of either their distribution or growth changes 

 and specimens of all are much to be desired. An artificial key 

 to the Recent species of Clypeaster is to be found in Mem. M. 

 C. Z., 46, pp. 22-25. 



Pal^otropus josephinse 



Loven. 1872. Oefv. Vet. Akad. Forh. f. 1S71. no. S. p. 21. A. Agassiz. 18S3. 

 Mem. M. C. Z., 10, p. 53 ; pi. XXIII. figs. 5-14; also pi. XXn'. figs. 

 6-15 (as Palaeohrissu-s liUgardi). 



Although the collection contains but a single specimen of this 

 uncommon spatangoid. the "'Narrative"* (p. 174") refers to its 

 occurrence on Pourtales Plateau in 110-220 fms. as though it 

 were met with more than once. The specimen at hand is ne-arly 

 bare. 20 mm. long, and has a distinct subanal fasciole and only 

 2 genital pores. It is thus still immature, as the adult, origin- 

 ally described as PaJaeohrissus hilgardi, has 4 genital pores, no 

 subanal fasciole and is over 45 mm. long. The growth changes 



