collected at Cape St. Lucas, 5 



vis ; valvis intermediis valde insculptis ; areis lateralibns seriebiis 

 granulorum a jugo radiantibus circiter vi. ; interdum irregularibus, 

 granis rotundatis, separatis, extatitibus ; areis centralibus clathris 

 creberrimis, jugo parallelis, horridis, extantibus, interdum granu- 

 losis, ornatis ; valvis terminalibus seriebus granulorum, circ. xx., 

 interdum bifurcantibus, ut in areis lateralibus, ornatis ; mucrone 

 Tix conspicuo ; limbo pallii angusto, pilulis furvicaceis creberrimis 

 minutis eonferto ; lobis valvarum bifidis, terminalibus fisn', is 

 circ. xi. a parte externa simplici disjunctis. Long. •?, lat. -48, 

 alt. -16 poll. 



Belongs to the group with minute setose scales. 



13. Ixchnochiton (? var.) prasinatus. 



I. testa 7. parallelo forma et indole simili, sed vivide viridi j ar. 

 diag. seriebus bullularum iriegulariter ornatis ; ar. centr. clathris 

 valde extantibus, acutis, jugo obtuso parallelis, utroque latere 

 circ. xvi. ; valv. term, seriebus bullularum circ. xviii. ; mucrone 

 submediano, inconspicuo ; umbonibus baud prominentibus ; tota 

 superficie minutissime granulosa : intus valvarum lobis mediarum 

 i.- term, circiter x.-fissis ; sinu lato, planato ; suturis plauatis ; 

 limbo pallii angusto, minutissime squamulis furvicaceis creberrime 

 instructo ; interdum pilulis intercalatis. Long. '8, lat. -4 poll., 

 div. 125°. 



14. Ischnochiton serratus. 



I. testa parva, cinerea, olivaceo hie et illic, pr8ecipiie ad suturas, 

 punctata, interdum sanguineo maculata ; ovali, subdepressa, suturis 

 indistinctis ; tota superficie minutissime granulata ; ar. diag. valde 

 distinctis, costis latissimis obtusis ii.-v. munitis, interstitiis nullis; 

 marginibus posticis eleganter serratis ; ar. centr. costis acutis, 

 parallehs, utroque latere 6irc. xii. ; jugo obtuso, baud umbonato : 

 costis transversis, subradiantibus, fenestrantibus, interstitiis im- 

 pressis : mucrone mediano, obtuso ; valv. term, costis obtusis, ut 

 in ar. diag., circ. xx. : intus valvarum mediarum lobis bifissis, 

 terminaliura circ. ix.-fissis ; lobis suturahbus magnis : I'mbo pallii 

 squamis majoribus, imbricatis, vix striatuhs. Long. "34, lat. '2 poll., 

 div. 115°. 



Differs from Elenensis in the sculpture of the terminal valves. 



15. Nacella peltoides. 



N- testa parva, Isevi, cornea, subdiaphana, ancyliformi, apice elevato, 

 valde insequilaterali, strigis pallide castaneis radiata ; intus njti- 

 dissima, subaurantia. Long. '14, lat. '11, alt. '05 poll. 



= Nacella. sp. ind., Maz. Cat. no. 263, p. 202. 



16. Acmcea (? var.) atrata. 



d. testa solida, rugosa, conica, apice paulum antrorsnm sito ; extns 

 costis crebris rotundatis irregularibus, hie et illic majoribus 

 sculpta, baud apicem versus discordanter corrugatis ; interstitiis 



213 



