622 
REPORT—1863. 
Pan. | La |Aca-! Maz.| Other 
Cat. | Paz.) pul.| Cat. | habitats. 
C |252| E 
256 
258 
C | 261 
A | 260 
264 | Mare 
268 
P| A |\273)| Gal. 
357 C 
274 
P|A|279| E 
281 
L. Cal. 
L. Cal. 
L 
L. Cal. 
P| C | 286 
A | 288 
289 | Marg. 
274| P 
263 295 
304| P.| A | 326| Marg. 
305 | P| C | 327 |E.Mar. 
336| P| A | 343 |E.Mar. 
337 | P| A | 344|E.Mar. 
344.| P| A | 334|K. Cal. 
P\A E.Mar. 
345 A | 337 |C.Mar. 
346| P 340 |E. Mar. 
328| P| A |347| E 
327 A | 349 
329| P| A |350| Gal. 
323| P| A | 352 
355 
A | 359 
P L 
367 
P|} A | 380 
Jp 
193) P| A |381]| Gal. 
196} P| A | 383 
200} P| A | 387 |G.Mar. 
P| A |388] Gal. 
197 | P| A | 389] Mare. 
Mare. 
2206 395 |PE.Mr. 
No. 
219 
List of Cape St. Lucas Shells. 
Ischnochiton limaciformis. 2 specimens. 
3| Ischnochiton Bean. 1 sp. 
Acanthochites arragonites. A few living sp. 
Patella discors. Dead. 
Patella pediculus. Dead. 
Acmea fascicularis. Abundant, living. 
Acmea mitella, jun. : 
Fissurella rugosa, jun. [A var. is first black, with 
two white rays; afterwards changes to whitish. | 
Fissurella microtrema. Common. - [Passes into 
rugosa. | 
Fissurella nigrocincta. 1 young sp. 
Glyphis inequalis. Rare. 
Rimula Mazatlanica. 2 sp. 
Haliotis Cracherodii. (Turtle Bay.) 
Haliotis splendens. (Margarita Island, with 4,5, 
and 6 holes.) 
Callopoma Fokkestt. Dead. 
Pomaulax undosus. Fresh, with Gulf Polyzoa. 
Uvanilla olivacea. Dead. 
Uvanilla unguis. Dead. 
Calliostoma eximium. Dead. 
Omphalius coronulatus. Dead ; not uncommon. 
Vitrinella Panamensis. 1 sp. off Spondylus. 
Nerita scabricosta. Abundant. 
Nerita Bernhardi. Abundant. 
Crucibulum imbricatum. Dead. 
Crucibulum spinosum. Dead. 
Crepidula aculeata. Dead. West and East Indies. 
Crepidula ? arenata, jun. * 
Crepidula excavata, jun. et var.* 
Crepidula onyx. Dead. 
| Hipponyx antiquatus. Dead. 
Hipponyx barbatus. Pacific Is. Fresh sp. 
Hipponyx Grayanus. Rare. 
Aletes centiquadrus. On Margaritiphora, &c. 
Bivonia contorta. Frequent, on shells. 
Petaloconchus macrophragma. Frequent, on shells. 
Spiroglyphus lituella. On Purpura planospira and 
muricata, from Socorro Is. 
Caecum subimpressum, Very rare. 
Turritella tigrina et var. Cumingi. 
Turritella sanguinea. (Whirls not shouldered.) 
Cerithium maculosum and dwarf yar., like medio- 
leve. Abundant. 
Cerithium uncinatum. Common; dead. 
Cerithium stercus muscarum. Rare; dead. 
Cerithium interruptum, Mke. Common. 
| Rhinoclavis gemmata. Rare. 
Pyrazus incisus. Rare. 
220 Cerithidea Mazatlanica. Dead. 
* A difficulty attends the identification of young specimens of these rare species, no 
series having yet been obtained. 
diate between the two. The young of excavata has a large swelling umbo projecting beyond 
the margin ; the umbo in “? var.” has the margin spreading round it, as in onya, jun., 
and in consequence appears turned in the contrary direction. The umbilicus above the 
deck exists in both forms; but it is not an absolutely constant character, even in adunca. 
* C. excawata, var.,”” in Mus. Cum. is exactly interme- 
