DR. P. P. CARPENTER ON CHITONIDjE AND A.CMMID3!., 



tenuiore; t. jun. leevi ; dein Krulis delicatulis, acutis, hand 

 granulosis, valde distantibiis, interdum obsoictis, filosa ; inter- 

 stitiis Latis, laivibiis ; tenui, planata, ovali, siibdiaphana ; niyro- 

 fusco, corneo radiatim strigata, seu varie maculata : mtits 

 livida seu aliida, colurihus externis transeimtibus ; limbo lato, 

 acuto. 

 Long. '7, lat. "56, alt. "12. 



= LottCa 1 patina, C. B. Ad. Pan. Shells, no. 367. 

 JIab. Panama {C. B. Adams). 



There is no described west-tropical species to which these shells 

 can be affiliatedj unless they prove to be a very delicate variety of 

 A. fioccata, Rve. Unfortunately the Panama limpets have never 

 been collected in sufficient numbers to make out their specific limits 

 satisfactorily. The names here given may stand as species or va- 

 rieties, according to future elucidation. In shape and texture, but 

 not in colour or sculpture, these shells resemble A. fasdcularis ; in 

 the latter respects, A. strigatella. They were named " tenera. Ad." 

 by Dr. Dohrn, but are suiHciently distinct from that West-Indian 

 species. 



ACM^A (? FLOCCATA, Var.) SUBROTUNDATA. 



A. t. "A. var. filosse" simili, sed subrotundata, magis elevata, 

 vertice subcentrali ; colore intensiore, lineis corneis crebrioribus, 

 angustis ; t. jun. seepe pallidiore, radiis duobus postice trian- 

 gulata : intus callo livido, tenuiore. 



Long. -53, lat. '45, alt. 'IS. 



= Lottia, sp. ind. a, C. B. Ad. Pan. Shells. no. 36S. 



llab. Panama ( G. B. Adams), 



ACM^A (? var.) VERNICOSA. 



A. t. parva, subrotundata, depresso-eoniea, apiee ad duas quintas 

 partes sito ; albido-mridi, strigis paucis rufo-fuscis hie et illic 

 ornata, seejnus radiis duobus candidis, postice triangulata; 

 extus lineis acutis radiantibus, valde distantibus, scepe obsoletis 

 vix sculpta : intus livida, callosa, smpius spathula Candida or- 

 nata ; basi subplanata, limbo angusto. 

 Long. -3, lat. -24, alt. -1. 

 Sab. Panama {Jewett, C. B. Adams). 

 =Lottia, sp. ind. b, C. B. Ad. Pan. Shells, no. 369. 

 Had this form been brought from the China Seas, it might have 

 been taken for the young of A. biradiata, Rve. From its solidity, 

 however, its rough exterior, and its callous interior, it appears to 

 be adult. It is barely possible that it may develope into A. vesper- 

 tina. It differs from the young of A. subrotundata in being much 

 thicker and less spotted with the green tint. 



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