WEST COAST HYDROIDS 19 



will answer the purpose in this paper, and it is unnecessarj^ to 

 discuss it further. 



I'he shore and shallow water forms have been carefully investi- 

 gated in only a few localities on the West Coast, and for that 

 reason the number of representatives of the Gymnoblastea re- 

 ported, is not very large, but those obtained show sufficient va- 

 riety to have several families represented. 



CLAYID.E 

 Genus CLAVA 

 Trophosome. — Hydrocaulus rudimental; hydrorhiza of creep- 

 ing tubes; both invested Avith perisarc. Hydranths club-shaped. 

 Gonosome. — Sporosacs on the body of the hydranth, prox- 

 imal to the tentacles. 



CLAVA LEPTOSTYLA Agassiz 

 CJava leinostyla Agassiz, Cont. Nat. Hist. U. S., 1862, p. 218. 

 Clava leptostyla Torrey, Hyilroida of the Pacific Coast, 1902, p. 30. 



Distribution. — San Francisco Bay, Cal. (Torrey). 



TURRID^ 

 Genus CRYPTA new genus 



Trophosome. — Hj^drorhiza of small fibres or almost entirely 

 degenerated. Hydrocaulus not strongly developed. The per- 

 isarc which envelopes the hydrocaulus also unites one with the 

 others, this connection being in the nature of a very thin en- 

 crustation. Hydranths claviform. 



Gonosome. — Gonophores producing free medusae. 

 CRYPTA HUNTSMANI new species 

 PI. I. Figs. 1-5 



Trophosome. — Hydrocaulus tubular, up to 8 mm. in height in 

 adult forms. Perisarc so thin as to be a mere pellicle. That 

 which forms the basal expansion is also very thin and trans- 

 parent. The hydrorhiza consists, in the young colony, of a net- 

 work of fine fibrils, but these appear to degenerate in the older 

 forms, so that when a single animal is separated from the colony 

 it pulls out like a fungus with a portion of the mycelium at- 

 tached. The hydranth appears much darker than the hydro- 

 caulus. It is usually club-shaped but seems to have much mo- 

 bility, so that its appearance differs much at different times. 

 In some cases the tentacles, which appear to be made up of a 



