S. F. Clark— iTydroich of flic Pacific Coast. 263 



As ^Murray r(>inarl<s, tliis species is nearly allied to Phinmhirla 

 rrf'sfafa, the A. phmui of Liuna'us, but is imicli elosev in lialtit, tiie 

 liydrotliecfB are Avider-inouthed and shallower and the teeth upon tlie 

 rim are unequal. An inipoi-tant error occurs in the synonyniv ol'liiis 

 species given bj'^ Mr. A. Agassiz. lie has, under the name .\<ihio- 

 phenia Franciscana the foHowing synonymy : 



Plumularai Franci.'^caiia Trask. 



Plumularla struthiontdes Murray. 



The Pluriiidarla Franciscana of Trask l)elongs to tlie geiuis Jfi/- 

 drallmanki: of llincks, as a glance at the figures and description of 

 Trask will show; and it is synonymous witli the Phnnalarid gracilis 

 of Murray. Hence the name of the above descriljed species should not 

 be A. Franciscana, but .1. strut hionides. 



EXPLANATION OF PLATES. ' 

 Plate XXXVIII. 



Figure 1. — Eudendrium, s]). ; from Santa Cruz, Cal. 



Figure 2. — Tubularia elegans; a, cluster of medusas buds; a, a', and«", buds in differ- 

 ent stages of development ; a'", an actinula escaping. 

 Figure 3. — Bimeria gracilis ; a, a' and a", sporosacs. 

 Figure 4. — Sertularella turgida ; a, the gonangium or gonotheea. 

 Figure 5. — Sertularella tur/jida ; another form of gonotheea. 

 Figure 6. — Sertularia Greenei ; a. and a', the gonangia (gouothecte) ; h, hydrotheca. 



Plate XXXIX. 



Figure 1. — Campanularia cylindrica ; la, the same showing the full length of the 



pedicel; 1 fc, the female gonotheea ; Ic, an abnormally dev^eloped 'lydrotheca ; \d, 



the male gonotheea. 

 Figure 2. — Campanularia Jusiformis ; '2a, '2h, and 2d, the same showing the amount of 



variation in the width and depth of the hydrotheca? ; 2e, 2/1 and 2(/. the gonothecse ; 



r, the rootstock or creeping stem. 

 Figure 3. — Sertularia furcata ; a, and a', the gonothecte. 



Figure 4. — Campamdaria everta; a, and a', the gonotheea?; r, the creeping stem. 

 Figure 5. — H^lecium tenellum ; from San Diego, Cal. ; r, the creeping stem. 



Plate XL. 

 Figure 1. — Sertularia anguina; la, a single hydrotheca showing the outline of the 



outer margin of the rim. 

 Figure 2. — Sertularia anguina; a portion of the main stem. 

 Figure 3. — Sertularia anguina, var. rohusta; a portion of the main stem. 

 Figure 4. — The same ; portion of a branch ; a, gonotheea. 

 Figure 5. — The same; with a monstrosity, a. at the extremity of the branch. 



