432 CEYLON PEARL OYSTER REPORT. 



EXPLANATION OF PLATES. 

 PLATE I. 



Fig. 1. Philyra, adanm, BELL. . (BELL'S " type "-specimen refigured.) x 2. 



a, hepatic facet, &c. x 2 ; b, buccal region with external maxilliped of one side removed, x 5. 

 2. Tlos havelocki, n. sp. x 3. 

 3. Halimus pehlevi, n. sp. x 2. 



a, ventral view of anterior region, x 5. 

 4. Halimus irami, n. sp. x 2|. 



a, ventral view of anterior region, x 5. 



5. Dodea alcocki, n. sp., ? , ventral view of anterior region, x 1 . 

 6. Cryptopodia pan, n. sp., ventral view of anterior region, x 4. 

 ,, 7. Zozymus gemmula, var. ceylonica, nov. x 2. 

 8. Derwnia spkndidti, n. gen. et sp., ventral view of anterior region, x 2. 



a, external maxilliped. x 2. 

 9. Euxanthus herdmani, n. sp. x 1|. 



a, ventral view of anterior region, x 1 J ; outer surface of wrist, hand and fingers, x 1. 

 ., 10. Calmania prima, n. sp. x 3. 



a, ventral view of anterior region, x 2. b, outer surface of hand, x 3. 

 11. Mertonia lanka, n. sp. x 4. 



a, ventral view of anterior region, x 8. b, anterior view, x 4. c, outer surface of hand, x 4. 

 ,, 12. Palicus jukesi (WHITE), sub-hepatic region, x 2. 



PLATE II. 



Fig. 1. Derwnia splendida, dorsal and ventral views. Nat. size. 

 2. Docleu alcocki, dorsal and ventral views, x f . 



3. Macrophthalmus latreillei (DESM.) A-E, five specimens illustrating the characters given in the 

 text. B shows regenerated cheliped ; opposite surface in small figure alongside. 



