5^4 REPORT — 18G3. 



11. Modiola capax, Conr. Galapa<?os, Cuming. [Lower] California, Naftall. 



Mazatlan, Carpenter. \^Iieiyen is the autliority for the shells described 



in the Maz. Cat, not Cpr.] 

 17. Modiola Braziliensis, Chem. " Brazil." [At f. 31, which appears the true 



Brazilian shell, we are informed that this specimen is a " variety from 



Guavaquil."] 

 .. Modiola nitens, "Cpr. Cat. Eeigen Col. Brit. Mus. California." [The shell 



was erroneously described as from " California " in P. Z. S., and does not 



appear in the Reigen Mazatlan Cat. :=M. suhptirpureiis, Mus. Cum.] 



5. Lithodomiiscinnamominus, Chem. Philippine Is. and St. Thomas, W. I. [=i. 



cinnamometts, Maz. Cat. 177. Probably an Adida.] 



8, Lithodomus Cumin(/ianus,J)]ir., MS. " North Australia and Mazatlan.'" [The 



species is fgilred from the Mazatlan specimen, which may probably be 

 the adult form of L. cah/culattis, Cpr.* The cup is not distinct, but 

 shows a tendency to the peculiar formation described in Maz. Cat. no. 174, 

 E,ve.'s diagnosis, however, appears written from Dkr.'s Australian^ speci- 

 mens, so labelled in Mus. Cmn. — a very distinct species, without incrus- 

 tations. The name was given by Mr. Cuming to a large Chilian species 

 brought bv the U. S. Expl. Exp.] 



12. Lithodomus Gnmeri, Phil. MS. in Mus. Cum. "N. Zealand." [The species 



=L. falcatus, Gld., and is certainly from California, where iti is found in 

 the rocks with Fholadidea pcnita.'j 



13. Lithodomus teres, Phil. "Mazatlan." [The specimens in Mus. Cum. are 



labelled " Cagayan, PhiV] 



14. Lithodomus coarctata, Dkr. Galapagos, Cuming. [= CreneUa c.,Mfiz. Cat. 172.] 

 16. Lithodomus caudigerus, Lam. " West Indies " [without authority]. " The 



calcareous incrustation produced beyond the ant. extremity is no specific 

 characteristic." \_Vide reasons for contrary opinion, Maz. Cat. no. 176: 

 = L. aristatris. Dr. Stimpson has seen Lithophagus arranging its peculiar 

 incrustation with its foot.] 



24. Lithodomus pessulattis, Rve. (Oct. 1857). JTab. ? — [The unique sp. figured is 

 labelled " Mazatlan " in Mus. Cum. It resembles plumula, with ventral 

 transverse rugae.] 



26. Lithodomus suhida, Rve. JIab. ? — [=Z. plumula, var.J 



6. Avicula Cvmingii, Rve., March 1857. " Ld. Hood's Is., Pacific Ocean, 



attached to rocks, 10 fms., Cuming.''^ [? =Margaritiphora Jivih-iata, 

 Dkr., var.] 



9. Avicula barbata, Rve. Panama, under stones at low water, Cmju'ng. [=3L 



Jimbriata, Dkr., = il/. Mazatlanica, Hani.] "Diflers from Cumingii in 

 regular sequence of scales, developed only at margin, and yellowish tone 

 of colour." 

 67. Avicula hetei-optera, Lam. N. Holland. " =A. sterna, Gld." [Gould's species 

 is fi-om Gulf Cal. ; but in Mus. Cum. it is marked inside " semisugitta.'''''\ 

 4. Placunanomia foliata, Brod. Is. Muerte, Bay Guayaquil. " May = ec/n«ate, 

 AV. I., but' has very much larger orifice." 



7. Placunanomia macroschisma, Desh. " Onalaska, Cuming'''' [who never was 



there]. Kamtschatka, Desh. [Vancouver district, abundant.] 

 7. Thracia plicata, Desh. " Mr. Cuming has specimens from California and St. 

 Thomas, W. I." [Cape St. Lucas, Xantus.'] 

 Melania. [Various species are described from " Central America," &c., which 



or supposed, are rejected altogether. Thus shells sent to Mr. Cuitiing, with authentic 

 name and locality attached, may appear soon after without any, or with erroneous, 

 quotation. The error is rendered graver by appearing with the weighty authority of 

 •' Mus. Cum." 



* The species described in the Brit. Mus. Cat. seldom appear in the monographs, 

 unless there happen to be a specimen in Mus. Cum. Some of the monographers often 

 coHtent themselves with figuring the shells that come most easily to hand ; and do not 

 eeem to consider it a part of their woi'k to pass judgment on previously described 

 ■BpecieSj or to concern themselves ivith what are small or difEcult. 



50 



