40 UNITED STATES NATIONAL MUSEUM BULLETIN 251 



specimens; the figure of the larva given by Tokioka (1953a, pi. 10, fig. 

 4) is evidently strongly deformed, but it seems to correspond to the 

 stage shown in figure dh in the present paper. On the other hand, A. 

 multiplicatuTJh described by Tokioka (1953a, p. 180) from Sagami Bay 

 seems to differ clearly from the group comprising the above-mentioned 

 forms in the following points: (1) fewer (up to 14) longitudinal 

 plications on the stomach; (2) existence of a pair of distinct caeca at 

 the proximal end of the rectum ; and (3) smaller (up to 530/a) embryos 

 with a nimiber of small vesicular bodies in the anterior part and fewer 

 of them in the posterior portion of the trunk. As none of these gaps 

 are filled by any of the comparatively numerous present specimens, it 

 seems more reasonable to distinguish Tokioka's specimens from Sa- 

 gami Bay as a distinct new form rather than to treat them together 

 with the group comprising the present specimens under A. multiplica- 

 tum. A new name, AmarouciuTn sagamiense, is here proposed for 

 that form. 



A. calif omicum Hitter and Forsyth closely resembles A. muUipli- 

 catum; it is highly possible that these two species are quite identical, 

 though I hesitate at present to treat them together, because their locali- 

 ties are so far apart. 



10. Amaroucium crateriferum Sluiler 



FiGrrRES 10, 11 



Amaroucium crateriferum Sluiter, 1909, p. 103, pL 5, fig. 7 ; pi. 8, fig. 11. — Van 

 Name, 1918, p. 163, fig. 112 ; pi. 33, figs. 45-46. 



MATERIAL EXAMINED 



Palau Islands : Iwayama Bay, east side of Oyster Pass ; GVF sta. 220. Two 

 colonies (USNM 11410). — Iwayama Bay, entrance of Oyster Pass; GVF sta. 

 236A. One colony (USNM 11424). 



Description. — One of the specimens examined is 43 mm.X40 mm. 

 in extent and 25 mm. in height ; the second is 65 mm. X 45 mm. in extent 

 and 8 mm. in thickness ; and the last one is somewhat conical in shape, 

 60 mm. X 40 mm. in extent and 55 mm. in height. They are massive, 

 yellowish or grayish brown, and attached to the substratum by the 

 lower surface. Surface is smooth but marked by irregular grooves. 

 System of arrangement of the zooids is indistinct. 



Zooids orange, orange-red, or reddish brown, open at bottom of 

 grooves, arranged so as to converge on point of attachment. Zooids 

 long, reacliing a maximum of 18 mm. in those examined, very proba- 

 bly reaching 20 mm. in length when alive. Postabdomen very long, 

 occupying nearly two-thirds of body length ; or may be 3 to 4 times as 

 long as thorax and abdomen measured together. Abdomen nearly as 

 long as contracted thorax. Branchial aperture 6-lobed; atrial aper- 

 ture situated near dorsoanterior comer of thorax, sometimes opening 



