IN THE SOUTH-WESTERN DISTRICT. 839 



fine threads which may spring directly in a single series from around 

 the micropyle, or may be united for a very shoit distance proximally. 

 In this respect the condition of Blennius is approached rather than 

 that of Gobius, but the divergence from the latter type is only one 

 of degree. 



When freshly removed from the ovary the zona was spherical, and 

 about ^-i mm. in diameter, the perivitelline space being small, but soon 

 expanding in sea-water. About 15 hours after extension, such ova 

 as were at all regular in outline had acquired a broadly oval shape, 

 the yolk mass remaining round. One example measured 1'06 mm, by 

 "78 mm. ; another, 1"25 mm. by "95 mm. We cannot say how far 

 either dimensions or shape conformed to the natural condition, as we 

 were unable to effect fertilisation. 



Crystallog-obius Nilssonii. Dub and Kor. 



This fish is exceediugly abundant on the Eddystone grounds and in 

 the deeper part of Falmouth Bay, forming in these localities, as 

 probably on all offshore grounds in the district, the chief food of half- 

 grown dories {Zeus fabcr) and large scald-fish {Arnoglossus laterna). 

 The latter is essentially a bottom fish, and all records with which we 

 are acquainted tend to confirm Collett's opinion that Crystallogobius 

 is an inhabitant of the lower strata of the water, if not actually a 

 bottom fish to the same extent as the Gobies. However, on the 8th of 

 May of last year a female was taken in a surface net near the Eddystone. 

 It measures 22 mm. in total length. The ovaries contain eggs (trans- 

 parent, like the rest of the animal, in the fresh condition) of which the 

 largest measure about 12 mm. in diameter. They are spherical, and 

 not sufficiently mature to justify any conclusion as to their appearance 

 in the ripe condition. 



CORRIGENDA. 



Capros aper (vol. v., pp. 44, 121). Advanced larvae of about 5 to 

 6'5 mm., taken off Fowey, have been referred in my previous papers 

 to Capros, chielly on account of the pigmentation, since the specimens 

 were not in the best state of preservation. This year I have had 

 several opportunities of observing in the living condition a larva 

 which certainly belongs to the same species, and is without doubt 

 a young Ctenolahrus riipestris. It would be ditficult to find a better 

 illustration of the diliiculty of determining a Teleostean larva at a 

 stage when the skeletal characters are insufficiently developed for 

 exact diagnosis, and especially when the conformation has been more 



