MUSEUM OF COMPARATIVE ZOOLOGY. 109 



bend there is a tubulated aperture directed backwards, with an expanded 

 fimbriated border. Similar tubes have been figured by Ellis, and on them 

 Lamarck founded the genus Tibiana, which he placed among the polyps. 

 (See figure in Ellis, also copied by De Blainville.) In this species the 

 tubes are tree and appear to have been buried in the mud by their smaller 

 end. Abundant in 270 fathoms off Havana. 



Marphysa antipathum. Pourt. 



Animal not observed ; tubes differing from those of the preceding spe- 

 cies in being attached by their whole length to the stems of a small 

 species of Antipatb.es. They are also somewhat smaller, and the tubular 

 apertures are entire, without fimbriae, and only slightly widened. 



Found, with the preceding, off Havana in 270 fathoms. 



Tubes of various forms wore also found, but not containing the animal, 

 or only insufficient fragments of it, so that they cannot be determined. 

 One tube deserves mention', it is white, parchment-like, straight and 

 flattened ; it is armed densely with spicules of sponges placed transversely, 

 and stiffened by the long threads of a Ilyalonema attached longitudi- 

 nally ; it contained only a very small fragment of the inhabitant. Ob- 

 tained in 270 fathoms off Havana. 



Pedicularia decussata Gould. (Proc. Bost. Soc. Nat. IIi~t., Vol.V. p. 127.) 

 As I have not Dr. Gould's specimens at hand for comparison, I refer with 

 some hesitation to this species, a small living shell dredged on May 29th. 

 As it is immature it is difficult to determine by the description alone. 



Terebratula cubensis Pourt. 



Shell globose, thin, light horn-colored, translucent, obscurely pentagonal, 

 smooth, or showing faintly the lines of growth; the inferior margin of the 

 transverse portion of the loop with three indentations, differing in this re- 

 spect from T. vitrea, in which this part is entire ; otherwise these two spe- 

 cie-; resemble each other xory closely. The largest specimen is lJy inch 

 long, T 9 ff of an inch broad, and T 7 ^ high. 



It may prove to be identical with an undescribed Terehratala, from a 

 recent formation of Guadaloupe, mentioned in Bull. Soc. Geol. de France, 

 Tom. xx. 1863. 



Several specimens, mostly large, were obtained off Havana in 270 fathoms. 



Terebratulina Cailleti Crosse. 



A number of specimens of this species, of all ages, were obtained with the 

 former. They are all smaller than the Guadaloupe specimen, figured by 

 Crosse, and perhaps on that account show the depression in the middle of 

 the dorsal valve less distinctly than the figure. 



