1865.] AND VARIETIES OF CHITONIDEH AND ACMEID&. 277 
tenuiore; t. gun. levi; dein lirulis delicatulis, acutis, haud 
granulosis, valde distantibus, interdum obsoletis, filosa ; inter- 
stitis latis, levibus ; tenui, planata, ovali, subdiaphana ; nigro- 
Jusco, corneo radiatim strigata, seu varie maculata: intus 
livida seu albida, coloribus externis transeuntibus ; limbo lato, 
acuto. 
Long. ‘7, lat. °56, alt. -12. 
= Lottia ? patina, C. B. Ad. Pan. Shells, no. 367. 
Hab. Panama (C. B. Adams). 
There is no described west-tropical species to which these shells 
can be affiliated, unless they prove to be a very delicate variety of 
A. floccata, 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 4. fascicularis; in 
the latter respects, 4. strigatella. They were named “‘ tenera, Ad.” 
by Dr. Dohrn, but are sufficiently distinct from that West-Indian 
species. 
Acma (? FLOCCATA, var.) SUBROTUNDATA. 
A. t. “A. var. filose” simili, sed subrotundata, magis elevata, 
vertice subcentrali ; colore intensiore, lineis corneis crebrioribus, 
angustis ; t. jun. sepe pallidiore, radiis duobus postice trian- 
gulata: intus callo livido, tenuiore. 
Long. °53, lat. 45, alt. +15. 
= Lottia, sp. ind. a, C. B. Ad. Pan. Shells, no. 368. 
Hab. Panama (C. B. Adams). 
Acma (? var.) VERNICOSA. 
A. t. parva, subrotundata, depresso-conica, apice ad duas quintas 
partes sito; albido-viridi, strigis paucis rufo-—fusecis hie et illic 
ornata, sepius radiis duobus candidis, postice triangulata ; 
extus lineis acutis radiantibus, valde distantibus, sepe obsoletis 
vix sculpta: intus livida, callosa, sepius spathula candida or- 
nata; basi subplanata, limbo angusto. 
Long. °3, lat. +24, alt. +1. 
Hab. Panama (Jewett, C. B. Adams). 
=Lottia, sp. ind. 6, 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 4. subrotundata in being much 
thicker and less spotted with the green tint. 
