MUSEUM OF COMPARATIVE ZOOLOGY. 247 



on the proximal side of the hydrotheca and one on the distal side. Hydro- 

 theca) tubulixr, with an entire margin which is slightly depressed on two oppo- 

 site sides. 



Gonosome. — Unknown. 



Locality. — Off Havana, Cuba. Depth, 175 fathoms. 



This species is closely allied to P. geminata AUman, but differs in the ar- 

 rangement of the branches, which in this form arise from opposite sides of the 

 stem and Lie nearly in the same plane, curving but slightly upwards. The 

 arrangement of the internodes on the branches is also different, as is the ar- 

 rangement of the nematophores. 



Cladocarpus tenuis sp. nov. 



Plate V. Figs. 31, 31 b. 



Trophosome. — Hydrocaulus attaining a height of an inch and a half, very 

 delicate, pale straw-color, the lower portion bearing a row of nematophores, the 

 upper portion giving rise to branches arranged alternately, and with three or 

 four very oblique internodes just below the branched portion ; the branches or 

 pinnae undi\'ided. Hydrothecoo deep, slender, tubular, smallest in the centre 

 and tapering both ways, largest at the distal end, a crenate rim and a large 

 rectangular or obtusely pointed median tooth ; each hydrotheca overarched by 

 the portion of the pinna which intervenes between it and the next. Supra- 

 calycine nematophores prominent, extending above the edge of the hydrotheca ; 

 mesial nematophore of about the same size of the supra-calycine, and attached 

 to the enlarged portion of the pinna just below the hydrotheca. The pinnse 

 are ornamented with a great number of internal chitinous ridges. 



Gonosome. — Unknown. 



Locality. — Lat. 25° 33' N., Long. 84° 21' W. Depth, 101 fathoms. 



This species is closely allied to Q. dolicotheca Allman ; it being similar in 

 every respect in regard to the trophosome, with the exception of the shape of 

 the hydrotheca}, and its having a more slender habit. These characters are 

 very constant, and are sufficient to enable it to be readily distinguished. 



Cladocarpus dolicotheca Allman. 



This species is represented in the collection by a single fine specimen from 

 a depth of 339 fathoms, taken in Lat. 24° 8' N., and Long. 82° 51' W. 



Aglaophenia apocarpa Allman. 



This species is well represented by some half-dozen colonies with corbulac 

 which are attached to what appears to be a much-worn outer investment of some 

 gorgonia-like or other branched form. They are about three inches in height, 

 and in good, clean condition. 



Locality. — Off Havana, Cuba. Depth, 175 fathoms, 



Aglaophenia distans Allman. 



Two fine specimens with their very long pinna) were dredged in a depth of 

 639 fathoms, Lat. 25° 33' N., Long. 84° 35' W. 



