i6 



surface reticulated, while the hexagonal sculpture disappears towards the aperture. But there 

 are four and a half whorls, increasing more regularly. The rcstrum being broken off, 

 I could not make out its form. No umbilicus. 



Colour: Yellowish-red (spirit-specimen). 



Dimensions: Height 1,75 mm.; max. diam. 1,40 mm. 



Operculum: Transparent, rounded, left-handed, six coils. 



A n i m a 1 : Quite as the above described variety of Peraclis reticulata. A strongly 

 developed "balancer" on the right side of the mantle makes me think, that the rostrum must 

 be long, probably curved in the same direction as in Peraclis reticulata var. minor. 



The characters of the shell differ sufficient!)- from that of Peraclis reticulata to regard 

 this form as a distinct species. Indeed, the shell is smaller, having four and a half whorls in 

 its spire: moreover these whorls increase gradually. 



3. Peraclis mohicccnsis n. sp. (PI. I, figs. 7, 8, 9, 10). 



Living animal : 



Stat. 243. 4°3o'.2S., 1 29° 25' E. i spec. 



Description: .Shell transparent, surface without reticulation, but with slightly marked 

 rays on the deep suture, especially on the last whorl. .Spire extremely short, four and a 

 half whorls. The first turns rolled up in the same plane, and entirely covered (shell being 

 seen from the aperture) by the veiy strongly bulging last whorl, which exhibits on the dorsal 

 margin of the aperture a tooth, directed towards the apex, and curved in the direction of the 

 last whorl ; this tooth is supported by a thick rib. Between this rib and the suture the rays are 

 especially strong. Rostrum straight, not curved. No umbilicus. 



Colour: None, the animal being seen through the thin shell (spirit-preservation). 



Dimensions: Height 0,80 mm.; max. diam. 1,20 mm. 



Operculum: Glassy, rounded, about four whorls, left-handed. 



A n i m a 1 : The only information I can give about the animal is, that this species undoubtedly 

 belongs to the genus Peraclis., as I have noted a short proboscis, the lips, surrounding the 

 mouth, uniting ventrally, and two symmetrical tentacles of the same size and without sheath. 



A short time after the single specimen had been figured, the shell was unfortunately 

 quite crushed into .small fragments, and the animal became so seriously damaged, that I had 

 to abstain from further investigation. What I could observe about the animal, has been 

 mentioned above. 



Though greatly regretting the accident which prevented me from giving a more complete 

 description, I hope the peculiarities of the shell will be sufficient to distinguish this species from 

 other forms. 



Peraclis moluccensis has evidently some affinity with Peraclis bispinosa (Pelseneer) ^) but 

 differs from it in being much smaller ■), in the very depressed spire, and in the tooth which 



1) Challenger Rep. LXV, p. 36, figs 9 — 10. 



2) The dimensions of P. bispinosa are : length 7,5 mm., diameter 6 mm. 



