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



that these networks do not exist either as vessels or as lacunae. 

 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 lacunse, 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.J 



38. tAssiminea subrotundata. 



IjL testa hand parva, laevi, tenui, fusco-olivacea ; anfr. nucl. ?...(de- 

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

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

 cata ; apertura rotundato-ovali, intus fuscescente ; peritremate 

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

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



Hah. NeeahBay; one specimen among Zflcww^e (>S^z^«7i). 



May prove to be a large Hydrohia. 



39. IF aludinella castanea, 



IP. testa compacta, solidiore, fusco-castanea, marginibus spires 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, baud continua ; labro acuto ; labio supra parietem obsolete, 

 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 Lacunce {Swan). 



May be an aberrant Assiminea. 



40. Mangelia crebricostata. 



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

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



