Ven-ill, Notes on Radiata. 371 



composed of long, stout plates, with the posterior points longest. 

 The suckers scattered over the surface are, also, mucli less numerous 

 than in T. Bricireus. 



Occurs under dead corals in the shallow tide pools and holes in the reefs at the 

 Abrollios and elswhere. — c. f. h. 



Chirodota rotiferum Stimpson, Amer. Journ. Sci., 29, p. i;!4, 1860. 



? Synapta rotifera Pourtales, Proc. Am. Assoc, 1851, p. 15. 

 Ghriodota rotifera Selenka, Zeitschr. fur Wiss. Zool.. 1867, p. 367. 



Plate IV, figures 9, 9 '. 



Elongated and slender, the whole surface tliickly covered witli 

 small, white, slightly ])rominent verruca>-. Tentacles 12, short, with 

 about five digitations upon eacli side, tlie two terminal ones longest. 

 Color, in alcoliol, light purplisli brown. The specimens, which are 

 not entire, are two or three inches long, and about '26 in diameter. 



Tlie calcareous, wheel-shaped bodies in the skin, are all very minute, 

 but variable in size, provided with 6 spokes, wIul-Ii are often thinner 

 along the middle, so as sometimes to appear almost as if double, rim 

 narrow, center not perforated. With these there are larger, oblong, 

 irregularly shaped, calcareous bodies, mostly enlarged and truncated 

 at the ends. 



Abrolhos Reefs, with the preceding, — C. F. Ilartt. F'lorida, — 

 Pourtales, 



The two specimens ol)tained appear to agree j^erfectly with tlie 

 descri])tion by Pourtales. Whether (J. pygmmn Miiller be the same 

 species, can be ascertained only by a comparison of specimens from 

 the different localities. Sliould this prove to be the case, Miiller's 

 name will have priority. 



No. 5. — Notice of (I (JoUeetlou of Erhinoderins from La Poz^ Lower 

 (Jdlifornln, lolth Descriptions of a new Genus. 



Published April, 1868. 



The Museum of Yale College recently received a small but vei-y 

 interesting collection of Echinoderms, collected by Capt. James 

 Pedersen, in the lower part of the Gulf of California, which gives 

 us some additional knowledge of the marine fauna of that very 

 prolific region. In these Transactions, I published last year a des- 

 criptive catalogue of the Echinoderms contained in the Yale Museum 

 from the west-tropical coast of America ; but in this small lot there 

 are two species, not known to me at that time, one of which a})pears 

 to be a new and remarkable sjenus of starfishes. 



