ACANTIIM. in 1| 



Hark snl.earinated. blarkMi ; mar-in wide, tuli.-i 

 white, hnm/ed. Tin- bark i< ol>lon<:, l>l:n-ki>h, i>,,rd, : 

 tuberculous l):iii(l ornamented with bunches of whit 

 Length 1") mill. Animal li-ht red ; head rounded, -ill- i'ddMi,etC. 

 ISO.) 



0a20ari0 J. (Hidalgo) ; A"/' Etiaso G (Issel) ; ' 

 (Caifassi) ; JV'//>/'s; ffefcrmo (Monte.) 



Aninthnrhitcx tmcti* Risso, Hist. Nat. de 1'Kur. Merid. iv, p. 269 

 (1826). CARUS, Prodromus Fumi;e Mediterrane.-e ii, pt. 1. p, 

 (1889). Chiton (Acanthochitea) ceneus MONTKKM- \n>, Journ. d. 

 Conchyl. 1878, p. 147. Chiton gracilis JMI-TI:., Ann. Mu. N . Hi>t. 

 (3), iii, p. 106, t. 3, f. 9a, b (1859). SOWB., Illustr. Index lirit. >h.. 

 t. 10, f. 6. C. fascicularis var. gracilis JEFFR., Brit. Conch, iii, 

 p. 212. 



With this form Monterosato identifies C. gracilis Jeffreys, the 

 description which follows : 



" C. fascicularis var. gracilis Jeffr. PI. 4, fig. 83. 



Longer than usual, with finer sculpture; girdle broader and 

 membranous, sparsely set with spines and mostly having an extra 

 tuft (occasionally two) at the tail. 



Wey mouth and off Mil/or d Haven. Dredged in deep water. 



Differs from A. fascicularis in being slender, the girdle more 

 sparsely pilose, and having one or two tufts behind the posterior 

 valve, 19 or 20 tufts in all. The granulation of valves is finer than 

 in fascicularis, coarser than in discrepans. As I have seen no' 

 Mediterranean specimens I cannot affirm their identity with th> 

 the south of England ; but they are probably the same. The 

 Mediterranean form has not been figured. Jeffreys in his later writ- 

 ings considered this a delicate deep-water form offasdculari9 t a <-.>n- 

 clusion with which I am disposed to coincide. Further study with 

 abundant material from the Mediterranean and Atlantic is i 

 to establish the true status of the form. 



The form described by Rochebrune as A. humufu* is pn>l>al> 

 synonym of A. ceneus. The original description follows: 



Acantliochites hamatus Rochebr. Shell elongated, 01 

 intensely carinated, the carina very hi.irh, linear, rugulose, poster 

 acute. Anterior valve rounded, intermediate valve- with the latt-ral 

 areas intensely granulated all over, the grains polygonal, 

 subumbilicated. Marginal ligament pale nitons with 9 .-hi 



