204 PROCEEDINGS OP THE AMERICAN ACADEMY 



Catopygus recens, A. Ag., nov. sp. 



Only denuded tests of this Bpecies were collected. Apex anterior 

 and corresponding with apical system. Prominent rounded keel at ex- 

 tremity of anal groove, sloping towards the actinostome, three genital 

 poj'es, abactinal system indistinct, odd anterior and anterior pair of 

 ambulacra of equal length, longer than posterior ones ; tubercles form 

 ing uniform granulation over the test, phyllodes and bourrelets well 

 marked. Test gibbous in median odd posterior interambulacral space 

 between apical system and anal opening, also in the centre of the 

 plates of the lateral posterior interambulacra, the swelling of this por- 

 tion of the test becoming more prominent on the actinal side ; actinos- 

 tome sunken, upper edge of anal opening flush with the test, the 

 posterior edge at the bottom of the anal groove. Ambulacral plates 

 of nearly uniform size along sides of the test, becoming gradually nar- 

 rower towards actinostome. — Station 192, 129 fathoms. 



Palceotropus Loveni, A. Ag., nov. sp. 



Differs from the West Indian P. Josepkince in being more elongate, 

 in having its greatest breadth near the posterior extremity ; apical 

 system, on the contrary, nearer the anterior extremity. It has also a 

 larger subanal fasciole ; the anus is placed on the upper plane of the 

 truncated posterior end ; its greatest diameter is horizontal, the pos- 

 terior part of the actinal plastron forms a rounded keel. — Station 

 210, 375 fathoms. 



Pourtalesia hispida, A. Ag., nov. sp. 



The species of Pourtalesia proper are readily separated into two 

 groups from the character of the test, the one containing such rectan- 

 gular forms, or more or less bottle-shaped forms, as two of the species 

 of Pourtalesia previously known (P. miranda, P. phiale), with the 

 additional species discovered by the Challenger (P. laguncida, P. his- 

 pida), and such forms as P. ceratopyga and P. rosea, which are more 

 or less triangular in outline when seen from above, their broad anterior 

 extremity sloping gradually towards the anal end, while the rectangu- 

 lar forms, such as P. hispida, P. carinata, P. Jeffreysi, are interme- 

 diate between the two groups, having something of the rounded test 

 of the former group, and the flattened actinal side with the more solid 

 test of the last. The present species, P. hispida, differs from its 

 nearest ally, P. Jeffreysi, in having a shorter anal snout, a more flat- 

 tened actinal surface, a smaller actinal plastron, and a smaller number 



