270 Mr. W. F. Kirby on 



pyloric cneoa were densely matted together and entangled 

 with parasitic worms ; there were about nine caeca. Beside 

 these the hepatic duct opened into the gut, Vertebrse 39 

 (15 abdominal and 24 caudal). Abdomen extends well 

 behind the vent into the tail. The stomach is elongate, 

 ctecal in sliape, and empty; its inner surface presented large, 

 coarse, longitudinal rugse. Liver small. 



Two strange Structures. 



1. An unobliferatcd yolk-sac {?). — Lying free in the peri- 

 toneal cavity to the right of the stomach and extending from 

 the liver anteriorly to near the vent was an elongate bladder 

 with a shiny pearly external coating of peritoneum. Its 

 posterior end was free and broad ; its anterior end was 

 narrow and formed a long neck which was distinctly traced 

 •up to the large vessels of the liver; from these vessels a 

 large bianch descended along the neck, and broke up into 

 smaller branches in the bladder-wail. 



2. A rectal ccecum. — From the legion of the pyloric c?cca 

 there descended a csecum which entered the anterior or 

 ventral surface of the rectum about 2 mm. above the vent. 

 ]n the posterior part of its course it was in intimate con- 

 nexion with the ventral aspect of the rectum. Its anterior 

 relations could not be ascertained with certainty, as during 

 the unravelling of the pyloric caca the anterior extremity of 

 the csecum got broken. 



The colour in life was violet-black. 



A single specimen, about 9^ inches long, Mas caught in the 

 trawl at Sta. 315, Bay of Bengal, near the Andamans, 

 705 fathoms. It has been figured and will appear in the 

 next issue of the " Illustrations of the Zoology of the 

 R.I.M.S. investigator.' '^ 



Named after Major Alcock, F.R.S., Superintendent of 

 the Indian Museum, in gratitude for the guidance and help 

 he has invariably given to the Surgeon-Naturalist. 



XXIX. — List of a S7nall Collection of Odonata [Dragonjlies) 

 from Ceylon, collected hy Mr. E. Ernest Green, ivith A^utes 

 on the Genus Zygonidia and its Allies, and Descriptions of 

 new Sjiecies o/ Zygonidia, Kirh., o7?c/0nychothemis, Braue.r, 

 from Ceylon and Tonkin. By W. F. KiRBY, F.L.S., 

 F.E.S., (tc. 



I HAVE lately received, thvougli Mr. W. J. Lucas, an assort- 

 ment of diagonflics collected by Mr. E. Ernest Green, chiefly 



