OP CONCHOLOGY. 281 



Diagnoses de Mollusques nouveaux provenant de Calif ornie 

 etfaisant partie du Musee de V Institution Sinithsonienne: 

 BY PHILIP p. CARPENTER. 



Angulus Ooiddii. Barleeia subtenuis. 



Oedalia subdiaphana. " (? subtenuis, vav.) ri- 



Psephis tellymyalis. mata. 



Tapes laciniata. " haliophila. 



Kellia ( Laperousii, var.J Chi- Drillia torosa. 



ronii. " (? torosa, var.^ aurantia. 



" rotundata. " penicillata. 

 Ostrea lurida. ? Daphnella aspera. 



Tornatella pupctocaslata. Chemnitzia tridentata. 



Cylichna planata. " f? var.J aurantia. 



Lottia gigantia, Gray. Volufella pyriformis. 



Bittium (ysiV. ?)escuriens. Ocinebra Poulsoni, (Nutt.,MS.) 



" attenuatum. 

 ? " quadrifilatum. 



Mr. Carpenter remarks that Capsa, H. and A. Adams, pro- 

 posed for a section of Scrobicularia, is an objectionable name, 

 inasmuch as Capsa, Lam., although a synonym of Iphigenia, 

 Schum., is still much in use. He, therefore, re-constitutes, in 

 a restricted sense, the ancient genus Lutricola, Blainv., for this 

 group intermediate between Scrobicularia and Macoma, and gives 

 the following description: — 



'^Lutricola. — Testa tumida, ssepe inaequivalvis, irregularis, 

 subquadrata seu antice producta; pars postica undata sen 

 truncata; cartilago fossa subinterna sita, ligamento curtiore 

 contigua; dentes cardinales utraque valva duo, laterales nulli." 



Ex. Lutricola ephippium, Solander, L. alta, Conrad, L. Dom- 

 beyi, Lam., &c. 



Oedalia, n. g. {Tellinidse.) — "Testa inflata, tenuis, sequival- 

 vis, sequilateralis cy clad ifor mis; margo baud hians, baud sinu- 

 atus ; ligamentum et cartilago externa ; dentes cardinales 3-2, 

 bifidi, laterales nulli ; sinus pallii magnus." 



Mr. Carpenter also describes the genus Lottia, Gray, as re- 

 stricted by him, as follows : — 



"Lottia. — Testa Patellis quibusdam seu Helcioni similis; 

 plerumque planata, solida, apice anterior!. 



Animal margine pallii intus papillis lamellosis circa dorsum 

 lateraque instructo, regione capitis interruptis ; pede elongate, 

 ovali, planato ; branchia minima." 



"This genus is intermediate between Acmxa and Scurria. 

 In Acmsea the mantle is simple, while in Scurria the entire 

 circumference is covered with protuberances; in Lottia the 

 protuberances are on the body, but absent from the head. 



