564 REPORT — 18G3. 



11. Modiola capax, Oonr. Galapagos, Cuming. [Lower] California, Nuttall. 



Mazatkn, Carpenter. [Meigen is the authority 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 trom 



Guayaquil."] 

 . . Modiola nitens, " Cpr. Cat. Reigen Col. Brit. Mus. California.' [Ihe shell 



was erroneously described as from " California " in P. Z. S., and does Lot 



appear in the Reigen Mazatlan Cat. : = il/. siihpicrpureus, Mus. Cum.] 



5. Ziihodotnus cinnamominus, Ohem. Philippine Is. and St. Thomas, W. I. [=X. 



cinnamomeus, Maz. Cat. 177. Probably an Adula.] 

 a Zithodomui CtimingianuSfDb.iMS. "North Australia and Mazatlan.'' [The 

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

 the adult form of L. calyculatus, Cpr.* The cup is not distinct, but 

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

 Rve.'s diagnosis, however, appears written from Dkr.'s Australian speci- 

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

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

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



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



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

 the rocks with Pholadidea penita.l 



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



labelled " Cagayan, Phil."^ 



14. Lithodomus coarctata,I)ln: Galapagos, Cwmerej'. [=0-e«e??a c, Maz. Cat. 17".] 

 16. Lithodomus caudigerus, T-ism. "West Indies" [without authority]. "The 



calcareous incrustation produced bevond the ant. extremity is no specific 

 characteristic." [Vide reasons for contrary opinion, Maz. Cat. no. 176: 

 = L. aristatiis. Dr. Stimpson has seen Ziikojjhagus arranging its peculiar 

 incrustation with its foot.] 



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

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

 transverse rugee.] 



26. Lithodomus suhula, THre. Hah.?— l_=L. pkimula, vex.] 



6. Airicula Cumingii, Rve., March 1857. "Ld. Hood's Is., Pacific Ocean, 



attached to rocks, 10 fms., Cuming." [? = Margaritiphora Jimlriata, 



Dki., var.] 

 9. Avimda barbaia, B-Te. Panama, under stones at low water, Cuming. [_=3L 



Jimbriata, l)kr., = il/. Mazatlanica, Hani.] "Differs from Cumingii in 



regular sequence of scales, developed only at niai'gin, and yellowish tone 



of colour." 

 67. Avicula heteroptera, Lam. N. Holland. " :=A. sterna, Gld." [Gould's species 



is from Gulf Cal. ; but in Mus. Cum. it is marked inside " semisagitta.'''] 

 4. Placunanomia foliata, BvoA. Is. Muerte, Bay Guayaquil. " May = ecAwiate, 



W. I., but has very much larger orifice." 



7. Plucunanomia macrosc'liisma, Desh. " Oiialaska, 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.'] 

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



or supposed, are rejected altogether. Thus shells sent to Mr. Cuming, with autlientio 

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

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

 "' Mus. Cum." 



* Tlie species described in the Brit. Mua. Cat. seldom appear in the monographs, 

 unless there happen to b3 a specimen in Mus. Cum. Some of the monographers often 

 coHlent themselves with figuring the shells that come nicst easily to hand ; and do not 

 eeem to consider it a part of their work to pass judgment on preyiously described 

 ■jspecies, or to concern themselves with what are small or dif&cult. 



50 



