collected at Cape St. Lucas. 477 
26. Fossarus purus. 
F. testa I’. angulato simili, sed alba, subdiaphana; anfr. nucl. ii., 
fuscis, ut in F’. tuberoso cancellatis ; norm. il. et dimidio, altis, 
valde tumentibus, carinatis; carinis iv., validissimis, acutissimis, 
quarum ii. in spira monstrantur; carinulis aliis antice et postice 
plus minusve expressis ; tota superficie minute spiraliter striata ; 
carinularum basalium interstitiis subobsolete decussatis; apertura 
late semilunata; labro a carinis valde indentato ; labio recto, an- 
gusto; umbilico magno, carinato ; operculo fusco, valde pauci- 
spirali, minutissime ruguloso, nucleo antico. Long. °08, long. 
spir. °03, lat. :08 poll., div. 90°. 
27. Litorina pullata. 
L. testa parva, solidiore, luctuosa; spira satis exserta; nigrescente, 
seu livido-fusco tincta, lineis spiralibus exilissimis pallidioribus or- 
nata; interdum obscure tessellata; anfr. v., subplanatis, suturis 
parum impressis; subleevi, striolis spiralibus tenuiter insculpta ; co- 
lumella intus incrassata; pariete haud excavato. Long. ‘4, long. 
spir. °18, lat. -29 poll., div. 60°. 
= Litorina, sp. ind., Maz. Cat. no. 399, p. 350. 
28. Litorina (Philippii, var.) penicillata. 
L. Ph. testa parva, lineis radiantibus, variantibus, delicatulis, rarius 
ziczacformibus, et cingulis duobus spiralibus, quorum unum in 
spira monstratur, elegantissime penicillata. Long. °33, long. 
spir. °14, lat. *2 poll., div. 50°. 
Closely resembling the West-Indian L. ziczac, var. lineata, 
D’Orb. Intermediate specimens, however, clearly connect it 
with the common Mazatlan form. 
29. Rissoa albolirata. 
R. testa parva, alba, crystallina, normali; marginibus spire undatis; 
anfr. nucl. ii1., levibus, mamillatis ; norm. iv., medio subconvexis, 
postice supra suturas planatis; basi subplanata, effusa, haud um- 
bilicata ; lirulis spiralibus crebris, obtusis, quarum cire. x. in spira 
monstrantur ; apertura subovata, peritremate continuo; labro 
arcuato, vix antice et postice sinuato, calloso; labio valido. 
Long. °1, long. spir. ‘08, lat. -04 poll., div. 25°. 
30. Fenella crystallina. 
F. testa alba, subdiaphana, turrita, rudiore ; marginibus spire rectis, 
parum divergentibus; anfr. nucl.?... (decollatis) ; norm. v., valde 
rotundatis, suturis impressis; costis radiantibus circ. xvi., valde 
rotundatis, haud extantibus, interstitiis latis; striis spiralibus 
regularibus, in anfr. penult. xvi.; apertura rotundata; basi ro- 
tundata; peritremate continuo; labro extus varicoso ; labio cal- 
loso. Long. ‘14, long. spir. ‘11, lat. -05 poll., div. 20°. 
