388 ECHINODERMS OF THE BRITISH ISLES 



3. Only 4 tube-feet along each dorsal ambulacrum (" Monaco ", Ixvi., 



p. 2G, PI. IV. 5) Ps. lapidus Her. 



Dorsal tube-feet more numerous ^ . . . . .4 



4. Tube-feet very scarce or absent on the mid-ventral radius ; skin 



covered by Globigerina ...... 5 



Tube-feet numerous on mid-ventral radius ; skin covered by 



Pteropod shells, sponge spicules, or other foreign bodies . 6 



5. Tube -feet on the anal lobes placed in tufts on small warts ; no 



lateral series of larger tube-feet {''Monaco'', Ixvi., p. 23, 



PL IV. 6) . . . . . . Ps. globigerince Her. 



Tube -feet on anal lobes not in tufts on warts ; a series of larger tube- 



feet along each side of body (" Monaco ", Ixvi., p. 25 ; xxi., p. 14, 



PI. II. 4-14, as Ps. occultatus Marenz.) Ps. Marenzelleri Her. 

 G. Tube -feet on nearly equal size. Five pieces in calcareous ring 



(" Challenger " Holoth., ii., p. 170) . . Ps. villosus Theel 



Tube -feet along radii larger. Ten joieces in calcareous ring 



(Marenzeller Echinodermen d. ostl. Mittelm., 1893, p. 15. 



Taf. IV. 9) . . . . . Ps. occidtatus Marenz. 



[Paelopatides Theel. ^J 



Body very broad and flattened, the ventral side forming a 

 distinct sole, separated from the dorsal side by a strongly 

 developed marginal brim. Mouth ventral, anus dorsal ; ten- 

 tacles 16(?)-20. Tube-feet in a double row in posterior part of 

 mid- ventral radius. Deposits present — three-armed bodies with 

 the arms widened at the end, and with a central spire — or absent. 

 Gonads on both sides of dorsal mesentery. 



Two species known from the N.E. Atlantic, namely Pcelo- 

 patides atlantica Herouard, off the Azores, 4020 m. (" Princesse 

 Alice " ; only one specimen known) ; and P. grisea Perrier,^ from 

 off the Canaries and between the Azores and Portugal, 1918- 

 4060 m. (" Talisman "). The two species are thus distinguished : 



Deposits absent ; a median furrow along the dorsal side. Dorsal 

 papillae not regularly arranged (" Monaco ", xxi., p. 16) 



P. atlantica Her. 



Deposits present, 3 -radiate bodies with arms bending inwards and 

 with central projection about one-third as long as the arms. 

 Dorsal papillae regularly arranged in pairs {'''Talisman'" 

 Holoth., p. 3()l) P. (/risea Perr. 



^ In order to see the tube-feet it may be necessary to clean the skin 

 for the foreign bodies ; placing the specimens in fresh water will make the 

 tube-feet swell, thus making them more distinct. 



2 This name is often incorrectly given as Felopatides. 



^ In the opinion of Herouard this species is identical with Pcelopatides 

 confundens Theel. According to information received from Miss Deich- 

 mann it is probably identical with the West Indian P. Agassizii Theel 

 (which Ludwig erroneously identified with P. confundens). 



