VERONICELLA. 239 



quite to the penis sac, where it becomes free, and is spirally wound. It is 

 largest about half-way from the vagina to the apex of the penis sac. It enters 

 the penis sac at the centre of its truncated apex. The penis sac is very 

 short and stout, cylindrical, of equal breadth throughout. It has no re- 

 tractor muscle. The cloaca is very short. On the vagina, just above the 

 penis sac, appears on some specimens an extremely small, sac-like organ, not 

 figured in the plate, as I am not entirely satisfied as to its presence. It is 

 perhaps a ('art sac, or a prostate. The ovary has the usual tongue-shaped 

 form. The oviduct is not much convoluted. The vagina is long, and ex- 

 tremely broad, several times convoluted. The genital bladder is oval, small, 

 with a short, stout duct entering the vagina at its upper extremity, bv the side 

 of the terminus'of the oviduct. 



This peculiarly stout, cylindrical penis sac and broad vagina were constant 

 in eight specimens examined, all from Astoria. In several other specimens 

 from Mendocino County, easily detected exteriorly by a more slender, taper- 

 ing body, and smaller, more rounded mantle, the penis sac was found more 

 elongated, the vagina less broad, the genital bladder larger, with a more deli- 

 cate duct. In these specimens, also, the testicle was very much larger, and was 

 not concealed in the liver, but only slightly entangled in it at one point, against 

 which it lay. The epididymis in these specimens was also free from the liver. 

 The genitalia of this form differ enough from those of the Astoria specimens 

 to warrant our belief in the existence of a second species of Prophysaon. We 

 have, therefore figured, also (Fig. I. of PI. XII.), the genital system of the 

 Mendocino County specimens. The question of specific identity is also diffi- 

 cult in living specimens. The digestive system of the same form is figured on 

 PI. XIII. Fig. 3, of Ann. N. Y. Lye. 1. c. It quite resembles that of Arion 

 hortensis as figured by Leidy in Vol. I. It is much more simple than that of 

 Ariolirnax. The salivary glands are very broad and very arborescent, and 

 form a broad collar around the oesophagus and commencement of the stomach. 

 The last-named organ is very broad. This variety has been received by me 

 from Dr. Cooper under the name of Arion Andersoni. If it really be that 

 species, it may retain its specific name, but must be considered still a true Pro- 

 physaon. Cooper's description of A. Andersoni does not agree with this slug, 

 especially as to the presence of a caudal mucus pore. 



VERONICELLA, BLAINVILLE. 



Animal lirnaciform (Vol. III. PI. LXVII). Body oblong-oval when con- 

 tracted, more or less linear when extended ; mantle covering the whole 

 body ; foot narrow, wrinkled transversely as if composed of numerous rings, 

 simple posteriorly; head distinct, and capable of being retracted under the 

 mantle; buccal mass with a jaw and with papillae arranged around the mouth ; 

 tentacles two, bifid, unequal, contractile ; eye-peduncles long and slender, an- 

 nulated, obtuse and oculiferous at tip. Pulmonary cavity on the right side, at 



