130 UNITED STATES NATIONAL MUSEUM BULLETIN 296 



Distribution: Utinomi described this species from material 

 dredged from about 30 to 50 fathoms around the north coast of 

 Amakusa Island and the entrance to Ariake Sea, western Kyushu, 

 Japan. It occupied large-sized trochiform and naticid gastropod 

 shells occupied by hermit crabs. 



When at Seto Marine Biological Laboratories in the fall of 1963, 

 I collected locally many littoral hermit crabs in miscellaneous medium- 

 sized gastropod shells. The following gastropod shells occupied by 

 hermit crabs were collected littorally at Seto Point, near Sirahama, 

 Wakayama-ken, Japan: Tectus (Rochia) conus (Gmelin), Chlorostoma 

 (Omphalius) nigerrimum (Gmelin), and Monilea sp. These shells were 

 occupied by Trypetesa habei. The cirriped also occurred at Susami 

 Bay in similar shells occupied by hermit crabs, including Tegula 

 rustica (Gmelin), where it occurred on the floor of the body whorl, 

 and not in the columella. I obtained ten large, complete specimens 

 and six incomplete specimens. 



Material: Reference specimens were sent to: Aust, BPB, Brit, 

 Paris, SFSC, and USNM. 



Dimensions: The specimen in figure 35a, from Seto, measures 

 2.4 X 1.6 mm, with an aperture of 0.80 mm. The specimen in figure 

 35b, bearing a male, was from Susami, and measures 5.26 X 4.14 mm 

 with an aperture of 1.69 mm. The largest specimen, from Seto, 

 measured 7.1 X 7.0 mm (length and width), with a 2.1 mm aperture. 

 These measurements were made on the first-mentioned specimen 

 after corroding in KOH and mounting on a depression slide in glycerin. 

 The other specimens were in 70 percent ethyl alcohol. 



Comparisons to type-material were made at Seto through the 

 courtesy of Professor Huzio Utinomi. 



The burrows appeared like those described by Utinomi for the 

 species, and were on the columella inside the shell. 



The female mantle has longitudinal muscle bands extending 

 posteriorly from the aperture, and circular bands extending from 

 the horny attachment knob area. The longitudinal bands are external 

 except in the region of the horny knob. 



The mantle is studded with extremely small, simple teeth. 



The aperture is bounded by chitinized lips which do not bear any 

 specialized spines or hooks. Small, simple teeth and a few short hairs 

 are scattered along the lips. 



At the rostral end of the aperture there is a pair of finger-like pro- 

 jections more or less in line with the apertural lips, which Utinomi 

 calls "orificial palps." These may not be identical in size or shape, 

 and are equipped with short, simple teeth. Between and behind (rostral 

 to) these palps is a single orificial knob, also equipped with appreciable 

 teeth. Behind this orificial knob is the large horny attachment knob, 



