Cooke — Haicaiiaii Zoiiifidac and Siiccincidae 269 



closely with specimens from Maui and Hawaii. As stated by 

 Sykes, specimens have not been found on Kauai by any of the 

 later collectors. Gould's diameter. 1/3 in. (8.3 mm.) (1/3 X i/n 

 in.) is probably erroneous, as his figure (natural size) measures 

 4.8 mm. in diameter. 



Owing- to the small amount of available material from the 

 island of Hawaii it seems best that the Hawaii form should be 

 included at present with Gould's species from Maui. Some of the 

 specimens are slightly larger than any that I have known to be 

 found on Maui. 



The size of the specimens from Hawaii as compared with those 

 from Maui is shown in the following table : 



!Max. Mill. .-i^- 1 Number Bishop 



T 1- 1- 1- Altitude . nr 



Locality diam. diam. ot Mus. 



mm. 



mm. mm. whorls ]\o. 



Maui S-2 3-7 30 .S 58473 



Maui 4.6 3.2 2.6 3 58473 



Hawaii 6.1 3.9 37 3/4 58472 



The embryonic whorls of specimens from Maui and Hawaii are 

 minutely punctate, as in the American and European species of this genus, 

 the punctation being arranged in spiral rows. Fresh specimens are trans- 

 parent chartreuse-yellow according to Ridgway's color nomenclature. The 

 only material available for dissection was a very much contracted alcoholic 

 specimen, an animal collected by Forbes on the island of Hawaii. Unfortu- 

 nately the tip of the tail had been broken off and the presence of a pore 

 could not be determined. The sides of the foot were dark slate-colored, the 

 sole slightly lighter in color ; the central area, about one-third the diameter 

 of the foot, being much lighter. The dorsal and shell-lobes were very much 

 contracted and intensely pigmented. The right shell-lobe is long and nar- 

 row and extends beyond the pulmonary orifice. The right dorsal lobe is 

 short, almost triangular, and very thick. The left shell-lobe is short. The 

 anterior left dorsal lobe is short and triangular in outline ; the posterior 

 left dorsal is broad in front, long and narrow behind. The mantle is light 

 yellowish flesh-colored, indistinctly and minutely stippled for a short dis- 

 tance above the collar. 



The right tentacle retractor does not pass between the oviduct and 

 penis but between the genitalia and buccal mass and under the main nerve 

 leading to the genitalia. This same arrangement was found in specimens of 

 V. alaskana Ball (A. N. S. P. 107017). 



[9] 



