28 Dr. P, P. Carpenter on new Forms of Mollusca 



that these networks do not exist either as vessels or as lacuna?. 

 Nothing can be more incorrect, for example, than the reticula- 

 tions figured by M. Blanchard in the interior of the muscles, 

 especially in the muscles of the legs. These muscles are cer- 

 tainly bathed by the blood of the lacuna?, but not a single blood- 

 globule ever penetrates between the fibres of a muscle. It is 

 possible, I readily admit, that in the adult Spiders the circula- 

 tory system may be a little more complex than in the young 

 individuals which have not yet undergone their first change ; 

 but this increased complication certainly does not go so far as 

 to cause the appearance of reticulations within the organs. Of 

 this we may convince ourselves by the examination of the cir- 

 culation in the legs of nearly adult Pholci. In these limbs it is 

 easy to see that there exists only a single arterial current and a 

 single venous current, without any ramification. 



IV. — Diagnoses of new Forms of Mollusca from the Vancouver 

 District. By Philip P. Carpenter, B.A., Ph.D. 



[Concluded from vol. xiv. p. 429.] 



38. tAssiminea subrotundata. 



1A. testa baud parva, laevi, tenui, fusco-olivacea ; anfr. nucl. ?...(de- 

 collatis) ; norm, v., rapide augentibus, subrotundatis; marginibus 

 spiras rectis, suturis valde impressis ; basi rotundata, baud umbili- 

 cata ; apertura rotundato-ovali, intus fuscescente ; peritremate 

 continuo ; labro acuto ; labio parum calloso ; columella arcuata. 

 Long. "28, long. spir. '13, lat. "2, div. 65°. 



Hab. NeeahBay; one specimen among Lacunae (Sivan). 



May prove to be a large Hydrobia. 



39. tPaludinella castanea. 



IP. testa compacta, solidiore, fusco-castanea, marginibus spirse rec- 

 tioribus ; rugulosa, lineis distantibus spiralibus irregulariter in- 

 sculpta ; anfr. nucleosis ?. . . . (detritis), vertice late mamillato ; 

 norm, iv., rapidius augentibus, tumidioribus, suturis satis im- 

 pressis ; basi regulariter excurvata, vix rimata ; apertura suborbi- 

 culari, haud continua ; labro acuto; labio supra parietem obsoleto, 

 supra columellam arcuatam intus calloso : operculo, anfr. iv. baud 

 rapide augentibus. Long. -21, long. spir. *09, lat. '17, div. 70°. 



Hab. Neeah Bay; one specimen among Lacuna (Swan). 



May be an aberrant Assiminea. 



40. Mangelia crebricostata. 



31. testa tereti, rufo-fusca, albo zonata ; anfr. nucl. ? . . . (decollatis) ; 

 norm. v. elongatis, subrotundatis, suturis impressis ; costis radi- 



