238 LORICA. 



Chiton volvox REEVE, Conch. Icon., t. 6, f. 81 (Feb., 1847). Lor- 

 iea volvox (Rve.) HADDON, 'Challenger' Polyplac., p. 31. Chiton 

 cimolius REEVE, Conch. Icon., t. 21, f. 141 (May, 1847). Lorica 

 cimolia H. & A. AD., Ann. Mag. N. H. (2) ix, p. 355. ANGAS, P. 

 Z. S. 1867, p. 224; 1871, p. 97. Aulacochiton wZwz SHUTTL., Bern. 

 Mittheil. 1853, p. 68. ? Chiton rudis HUTTON (see below.) 



The differences between L. volvox and L. cimolia are easily effaced 

 when a good series is examined. The young show great variation in 

 the pustulation of the lateral areas, the pustules sometimes being 

 scattered, radiating, cords obsolete. The dorsal ridge generally 

 has a central fine carina with a long narrow smooth triangle on 

 each side, but this varies also. The second valve has a rather large 

 median patch of scattered or diverging series of pustules. The color- 

 ing varies a good deal in the series before me. 



I am disposed to consider Hutton's Chiton rudis a synonym of 

 this species, but my opinion is founded upon a study of the original 

 description only, which is as follows : 



Chiton rudis Hutton. Oblong ; margin with minute scales ; 

 valves elevated, flattened on the sides, not keeled ; apex of anterior 

 valve recurved, with its posterior margin slightly convex at the sides 

 and deeply concave in the center; posterior margins of intermediate 

 valves straight ; posterior valve rather small ; apex posterior, pointed 

 and emarginate. Anterior valve and lateral areas with radiating 

 moniliform ribs; posterior and median areas widely but rather irreg- 

 ularly, deeply longitudinally furrowed, with narrow ridges between 

 Margin gray, with broad, irregular, reddish-brown transverse 

 patches ; valves grayish-brown ; interior grayish-white. Length 1*75, 

 breadth '75 inch. Founded on a specimen in the Colonial Museum, 

 locality not stated. (Hutton, in Trans. N. Z. Inst. iv, 1872, p. 179, 

 and Man. N. Z. Moll. 1880, p. 113.) 



Section Loricella Pilsbry. 



Sinus in tail valve a mere wave ; jugal sinus lobed ; girdle widest 

 in front, not cleft behind. 



L. ANGASI Adams and Angas. PI. 51, figs. 9-13. 



Shell ovate, coarctate and angulate behind, pale brown, variegated 

 with green. Anterior valve concentrically striated and having 

 radiating pustulose ribs ; posterior valve narrow, transversely sulcate 

 and densely longitudinally lirate ; median valves subcarinated, the 



