50 .Mr. F. Walker on some uadescribed Ceylon Insects. 

 Fam. Cerianthidse. 

 Genus Cerianthus. 



Sp. 4. Cerianthus Lloydii (mihi). Specific character. Me- 

 senteric prolongations of the septa regularly graduated in length. 

 Basal pore central. 



This species differs signally from C. membranaceus and C cy- 

 lindricus in the arrangement of the membranous plates which 

 spring from the walls of the elongate abdominal cavity. In 

 those (according to the researches of i\L Haime) the ordinary 

 lamellfE are short, while two are immensely prolonged, even to 

 the bottom of the visceral cavity. In the present species the 

 lamellae are twenty-four in number, of which one pair is exceed- 

 ingly minute, while the opposite pair extends close to the basal 

 pore. From the one to the other of these conditions there is a 

 regular gradation in length ; but from the longest to the middle 

 pair the diminution is slight, while from the middle pair to the 

 shortest it is great and rapid. 



General Description. — Form. Not differing in any recognized 

 particular from C. membranaceus. 



Colour. Column : a rich chestnut anteriorly, fading into a 

 pellucid buff or drab posteriorly ; the fi-ont edge of this colour 

 is abrupt, and forms a serrated marginal line. 



Disk pellucid whitish, separated from the tentacles by a broad 

 ring of dark brown. 



Tentacles: the peripheral rows barred alternately with white 

 and brown — four to six bands of each colour, which is more opake 

 or more pellucid in different specimens. The gular tentacles 

 dark chestnut-brown. 



Size. Six inches in length when extended, with a thickness 

 varying from half an inch to one-fourth. 



Locality. Menai Strait. 



The specific name I have selected in honour of Mr. William 

 Alford Lloyd, whose talent and enterprise have done so much 

 for aquarian zoology. The species has been obtained in some 

 plenty by that gentleman, who first introduced it to notice in the 

 spring of 1856. 



VIII. — Characters of some apparently undescribed Ceylon Insects. 

 By F. Walker. 



[Continued from vol. ii. p. 286.] 



Fam. Cicindelidse. 



Tricondyla tumidula. Atra, thorace brevi fusiformi glabro 

 nitente lateribus subconvexis, elytris convexis fusiformibus rude 



