280 



REPORT — 1856. 



No. of 

 Speci- 

 mens. 



Other Localities. 



488 



489 ■ striosura, n. s 

 490 tortuosum, n. s 



491 ventricosutn, n. s. (?Kellia) 



492 Crassatella gibbosa, Sow. 



493 Mulinia donaciformis, //a«/.[.'] 

 [.' = >/. angulata, Gray,] 



veutricosa, Gld. 



l = Mactra exoleta, Gray."] 

 Lutraria elegans, Sow. (Mactra) 



Not L. undulata, Gld. teste 

 C. B. Ad. 

 496 Mactra velata, Phil. 



Anatina alta 



(? Thracia or Periploma.) 



Pandora cornuta, n. s 



Potamomya sequalis, n. s.... 



Amphidesma pulchrum, Sow. 



497 



— inflata, n. s 



— trigonalis, n. s 



Corbula bicarinata, Sow 



biradiata, Sow 



obesa, //& 



ovulata, Sow 



rubra, n. s 



tenuis, Soiu 



— ■ — ■, sp. a, like Taheitensis ... 



, sp. h 



Solecurtus affinis, n. s 



Solen rudis, n. s 



Pholas crucigera. Sow 



= crucifera, Sow. = cruel ffer. 

 Mull. 



tubifera, ;S'ow 



xylophaga, Fal. (non Desk.) 



oft mud, under man 

 groves, near h. w. & 

 outlet of small stream, 

 with Area tuberculosa. 



U.S., deep in sd.,l.w.+ 



[l.w 



coarse sd. among st., 



sp. a, like lanceolata 



, sp. b 



Orbicula Cumingii, Brod... 



filling the bottom of an 

 old" dug-out," h. w, 



underside of St., 1. w. 



1 

 1 



1 V. 



Iv. 

 14 



6 V. 



10 



1 



Iv. 



3 



2 

 260 

 21 

 6v. 



7 



1 

 Iv. 

 Iv. 

 2v. 



10 

 55 



1 



1 

 20 



2v. 

 Iv. 

 50 



Carac, Cum. teste Sow. in P. Z. S. ; St 



Elena and Pan., Cum. teste Sow. in 



[Conch. 111. 



St.Elena&Xipix.,sdy.m.,llfm., Cum.; 

 [Payta, Fontaine. 



" The Atlantic analogue is L. canali- 

 culata, Say." 



[7-17 fni.. Cum, 

 Rl. Llej., Carac, St. Elen., sdy. mud, 

 Chiriqui & Carac. ,s.&m.,3-7fm.,CM7M, 

 8° 57'-21° 32', 22-33 fm., Hds. 

 Xipix., Mont., Carac, sdy ra.,7-17 fm., 

 [Cum. 

 Bay Montijo, sandy m., 12 fm.. Cum. ; 

 [Maz., Jew. 



" Like S. Caribceus." 



Is. Puna, B. Carac, Nicoya, soft sand- 

 stone, §-t. ; soft stone, 1. w. ; hard 

 clay, 13 fm.. Cum. 



Carac, in decayed wood, 10 fm.. Cum. ; 

 [Payta, Fontaine. 



Payta, St. Elena, 1. w.— 6 fm., Cum. 

 Chili and Peru, Desh. 



If this list of species be estimated according to the standard of judgment 

 followed in the Mazatlan Catalogue, which is necessary for a fair comparison 

 between the two, the following numbers will not be needed : — 



Univalves : 5, 33, 52, 70, 72, 164-, 174, 199, 211, 212, 216, 218, 241, 330, 

 334, 337, 343, 348, 349, 362,= 20. 



Bivalves : 422, 432, 482, 483, 484,=5. 



The names given to 459 and 471 are also not required. 



Others may be discovered on a comparison of specimens or figures (which 

 it is to be hoped the Trustees of Amherst College, who possess the types, 

 will cause shortly to be published), though they are not recognized from the 

 descriptions alone. The discovery of a large number of deep-water species 

 was due to the hermit crabs. Certain observed differences of station between 

 Messrs. Cuming and Adams are very interesting ; in a few there may be 

 error ; from others we learn what great latitude is allowed to some of the 



