132 bulletin: museum of compakative zoology. 



ing 2-5 joints) of dull purplish-brown ; these bands are not visible on the lower 

 surface. 



Mauritius. N. Pike, Collector. One specimen. 



This interesting specimen was received at the Museum in 1875 and bears the 

 label " Ophiopeza fallax." At first sight it might be mistaken for a young indi- 

 vidual of that species, but examination of the oral surface with a lens soon shows 

 how very different it is. Its close resemblance to Ophiopeza aster Lyman is ob- 

 scured by its very different coloration and much more flattened arms. 



ASTROPHYTIDAE. 



Conocladus, gen. nov. 



(Greek kwvos = cone + K\dSos = branch, in reference to the branching arms and the 

 large conical tubercles.) 



Disc divided into five radiating wedges by the pairs of radial shields and covered, 

 together with the upper surface of the arms, by an uneven pavement of polygonal, 

 flat granules of very diverse sizes, among which large, conical, or rounded tubercles 

 are irregularly scattered. (In young individuals these tubercles are few and there 

 may be only a single one on each " radiating wedge.") Arms branching dichot- 

 omously, with four or more divisions ; the distance of the first division from the 

 margin of the disc is about equal to the diameter of the disc. Under surface of 

 disc and arms covered with a pavement of small, rounded granules. Tentacle- 

 scales (or arm-spines) about 4, short, peg-like, and somewhat flattened, terminat- 

 ing in 3-5 minute, glassy points. Mouth-angles with a group of flat, pointed 

 teeth, deep in the mouth, and a few scattered, spiniform, oral papillae along the 

 margins. 



In the structure of the disc, though not in its ornamentation, this remarkable 

 genus resembles Astroporpa more nearly than it does any of the Astrophytidae, 

 but in the branching of the arms it is intermediate between Trichaster and Gor- 

 gonocephalus. 



Conocladus oxyconus, sp. nov. 



(Greek, d£vs = sharp -f- kwvos = cone, in reference to the pointed form of the cones 

 on the disc.) Plate. 



Diameter of disc 18 mm. Length of arm about 60 mm. ; width of arm near disc 

 6 mm. ; height of arm near disc 4 mm. Radiating wedges of disc separated from 

 each other by 5 deep, very narrow grooves with vertical sides, which meet at cen- 

 tre of disc in a hole or pit scarcely a millimeter in diameter but fully 2 millimeters 

 deep. Each wedge is covered with plates, grains, or granules, usually flat and 

 smooth, sometimes rounded, of very diverse sizes, the largest about a millimeter 

 across. Among these are scattered 5-7 conical tubercles, about 2 mm. high and 

 1.5 mm. in diameter at the base. The tubercles are smooth at the base but are more 

 or less rough with pits and ridges at the tip. They have no regular arrangement, 

 but one is at the innermost angle of the wedge. The pavement of plates and gran- 



