410 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 14 



a more transverse proximal border which bears a moderately large lyrula 

 with laterally extended points; the cardelles are strong and bluntly 

 pointed. The peristome is elevated, thin, bearing 2 to 4 small evanescent 

 spines on the distal border, the proximal border higher and extended 

 proximally into a deep rounded sinus which is broad enough to expose 

 at least a part of the lyrula. 



The avicularium is usually median (often slightly to one side of the 

 midline), slightly raised, the narrow and long-pointed mandible directed 

 proximally; it is rather unique in that it is placed entirely proximal to 

 and separated from the fold of the peristomial sinus. In spite of this 

 separation and frontal position the species appears to belong with those 

 which have the median suboral avicularium, as the avicularian chamber 

 is continued as a narrow tubule around the base of the peristome on both 

 sides. 



The ovicell is comparatively large, about 0.26 mm wide, the front 

 finely granulated, with numerous small pores, and the base surrounded 

 by a thick collar ; becoming more or less immersed with age. 



As Marcus (1938:46) has already pointed out, the S. reticulata of 

 Robertson, from California, and that of Okada and Mawatari, from 

 Japan, with a rounded avicularium enclosed in the peristomial sinus, 

 cannot be reticulata but another species. (See S. prolifica.) 



The species has a very wide distribution, if the records can be trusted, 

 from Australia, where it was described, to northern Norway and around 

 the world. It has hitherto been noted in the Eastern Pacific only at the 

 Galapagos Islands (Canu and Bassler, 1930:27), and apparently it is 

 not common in this region as only a few colonies were noted at the various 

 localities. 



Hancock Stations: 155-34, Albemarle Island; 170-34, Chatham 

 Island; 411, Duncan Island; 430, Wenman Island, and 439, James 

 Island, Galapagos ; and 580-36, San Marcos Island ; 249, Isla Partida, 

 and 275, Raza Island, Gulf of California. 20 to 150 fms. Also the writer 

 has a specimen from Halape, Hawaii, collected by Dr. R. W. Hiatt. 



Smittoidea transversa (Busk), 1884 

 Plate48, fig. 11 



Smittia transversa Busk, 1884:152. 



Zoarium encrusting, multilaminar. Zooecia of moderate size, 0.40 

 to 0.55 mm long by 0.30 to 0.40 mm wide, alternating in series and some- 

 what hexagonal in form. The front is a slightly ventricose, granulated 

 pleurocyst; the areolar pores conspicuous, with a few additional frontal 

 pores. The primary aperture is nearly round, 0.13 mm wide; the lyrula 



