CYNTHIA MUEUS. 89 



of rounded nodules ; that on the left side is placed 

 immediately above the intestinal loop, and is somewhat 

 pyriform with the wide end forward or inclined on the 

 ventral margin ; the right-hand organ is situated on 

 the loop of the intestine and is irregularly oval. The 

 nodules (PL XXXIII, figs. 4 and 5) composing the 

 organs are compound, comprising both male and female 

 elements ; they are pyriform and pedunculate, with 

 the sperm-cells placed at the broad end and the eggs 

 at the narrow ; the sperm-cells are large, ovate, and 

 obtuse. The interstices of the reproductive nodules 

 are for the most part filled up with irregularly-formed 

 bodies, apparently modified pallial processes, none of 

 which are found in any other part of the pallial wall. 

 When contracted in spirits, the test of Cynthia moriix 

 has a strongly wrinkled and scaly aspect, very different 

 from its attractive appearance in a fresh state. 



6. Cynthia tessellata Forbes. 



(PI. XXX, figs. 8 and 9 ; PI. XXXII, figs. 6 and 7 ; 



PI. XXXIII, figs. 6 and 7 ; PI. XL VIII, fig. 7 ; 



and figs. 57 and 58 in text.) 



Cynthia tessellata FORBES in Brit. Moll. I [1848], p. 38, pi. 

 D, f. 3; [COCKS in Rep. R, Coriiw. Polyt. Soc. 1849 

 (1850), p. 72 ; FORBKS in Rep. Brit. Assoc.for 1850 (1851), 

 p. 242; ANSTED & LATHAM Channel Isl. (1862), p. 219; 

 ALDER in Rep. Brit. Assoc. for 1866 (1867), p. 208]. 



Bodij transversely ovate, rather depressed, tawny- 

 yellow with darker spots, attached by an expanded 

 base. Apertures distant, tubular, purple. Test coria- 

 ceous, tessellated by regular oblong spaces, generally 

 hexagonal, and concentrically ridged, with a dark 

 reddish or purplish centre, the lower or attached 

 surface very thin without markings. Mantle thin, rosy 

 flesh-coloured spotted with white. Tentacular filaments 

 pinnate or sub-bipinnate. Branchial sac with three or 

 four folds on each side. Oral lamina with filaments. 



