88 Natural IIistorv Bulletin. 



ally. Lafcca vciiiisla. and also by the fact that the margin is 

 very slightly, if at all, everted. The other species is still 

 more robust, and perfectly smooth, the annulations which 

 make Z,. vciiiista so attractive being entirely absent. 



Two new species of Cryptolan'a were added to this inter- 

 esting genus. One was among the most graceful forms of 

 hydroids secured, having exceedingly large and long hydro- 

 thecce gracefully curved with their bases twisted together, a 

 very distinct and striking species. Another form is distin- 

 guished by profusely annulated Iwdrotheca^ which are nearly 

 opposite on the potysiphonic stem. Another interesting hnd 

 was a species which bears a very striking resemblance to 

 Lafiva convallaria. but a closer examination shows that each 

 calicle is separated from the stem by a distinct partition or 

 septum, a character which, according to Allman, must throw the 

 Havana species into the genus Lictordla. The gonangia are of 

 the peculiar anchor shape described by Clarke, but the top is 

 produced into a tube through which the ova apparenth' 

 escape, and not through the lateral flukes of the anchor. 



Some novel forms were encountered among the sertularians. 

 One species, growing to a height of about six inches, was pro- 

 vided with the largest hydrotheca; the writer ever saw. 

 These were further remarkable in being in the form of a 

 parallelopipedon, with a square aperture and an operculum 

 composed of four flaps. The margin is ornamented with 

 a number of false margins, as if produced by successive 

 periods of growth. Scrtularia i)itegrithcca has \'ery large 

 cylindrical h3drothecie without opercular flaps. The gonan- 

 gia of this species are almost unique in springing apparently 

 from the side of the hydrotheca'. An exceedingly delicate 

 Scrtularia is characterized by having the h^-drotheca' in pairs 

 with their backs contingent, and borne on the side, not the 

 front, of the stem as in the genus Dcsiuoscxphiis. Scrtularia 

 tu/)it/icca completes the list of sertularians from this region. 



A number of interesting Plu.muf.arid.-e were dredged on the 

 pentacrinus ground. Plu)nularia iiic<^\rIoccp/ia!(i and . \utcu~ 

 uclla oi-acitis were found. A fragmentary specimen, with 



