LARVAL AND POST-LARVAL TELEOSTEANS. 373 



taken by Crawshay* in the outer western area of the English Channel, 

 31 and 33 mm. in length, at a depth of about 50 fathoms. 



The pigmentation of the single specimen recorded differs considerably 

 from that of the full-grown adult. Two conspicuous pale bands are 

 represented. One lies across the caudal peduncle, as in the adult ; the 

 other occupies a position directly behind the head in the region of the 

 pectoral and first dorsal fins. A faint yellow tinge is present on the 

 caudal and pectoral fins, while alternate dark and light bands are present 

 on the dorsal fins. Pigment is very sparing on the ventrals, being 

 limited to a few dark splashes at the base and on the middle of the 

 larger rays. 



Crystallogobius nilssotii Diib. and Koren. 



Adult Crystallogobius are frequently met with in the neighbourhood, 

 being especially numerous on the Eddy stone Grounds. Sexual dimor- 

 phism is a distinct characteristic. The males have considerably more 

 pigment than the females, while the body is deeper and more compressed 

 laterally than in the female, which has a much more slender body and 

 more pointed head. The first dorsal fin is present only in the male, and 

 contains two long rays. The second ray is the longer, and is joined to the 

 body by a wide membrane. 



In June, adult males were found in attendance on the eggs, which 

 were attached to the inside of empty tubes of Chcetopterus variopedatus. 

 These were trawled on the Eddystone Grounds, chiefly in the area south 

 and west of the Eddystone rocks. A similar habitat was noted by Grieg, f 

 who observed the eggs of this species inside tubes of C. sarsi. 



The records of this species confirm Holt's observations on the pelagic 

 habit of this transparent goby. The young stages have not been sufii- 

 ciently cleared up to give a definite idea of the distribution and life- 

 history of the species. 



TABLE XIX. 

 Record of Crystallogobius nilssoni Dub. and Kob. 



1898. 



