collected at Cape St. Lucas. 5 



vis ; ralvis intermediis valde insculptis ; areis lateralibus seriebus 

 granulorum ajugo radiantibus circitervi.; interdum irregularibus, 

 granis rotundatis, separatis, extantibus ; areis centralibus clathris 

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

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

 interdum bifurcantibus, ut in areis lateralibus, ornatis ; mucrone 

 vix conspicuo ; limbo pallii angusto, pilulis furvicaceis creberrimis 

 minutis conferto ; lobis valvarum bifidis, terminalibus fisc? is 

 circ. xi. a parte externa simplici disjunctis. Long. '7, lat. '48, 

 alt. -16 poll. 



Belongs to the group with minute setose scales. 



13. Ischnochiton (? var.) prasinatus. 



I. testa J. parallelo forma et indole simili, sed vivide viridi ; ar. 

 diag. seriebus bullularum ir; egulariter ornatis ; ar. centr. clathria 

 valde extantibus, acutis, jugo obtuso paiallelis, 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, prsecipue 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, 

 parallelis, utroque latere circ. xii. ; jugo obtuso, hand umboriato : 

 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, 

 terminalium circ. ix.-fissis ; lobis suturalibus magnis : 1'mbo pallii 

 squamis majoribus, imbricatis, vix striatulis. Long. '34, lat. *2 poll., 

 div. 115. 



Differs from Elcnensis in the sculpture of the terminal valves. 



15. Nacella peltoides. 



W. testa parva, leevi, cornea, subdiaphana, ancyliformi, apice elevato, 

 valde inaequilaterali, strigis pallide castaneis radiata ; intus niti- 

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



= Nacella. sp. ind., Maz. Cat. no. 262, p. 202. 



16. Acm&a (? var.) atrata. 



A. testa solida, rugosa, conica, apice paulum antrorsnm sito ; extnfl 

 costis crebris rotundatis irregularibus, hie et illic majoribus 

 sculpta, baud apicem versus discordanter corrugatis ; interstitiis 



213 



