138 “TERRA NOVA” EXPEDITION. 
larvae of Paralepis and related genera with produced snout. It has been shown above 
(p. 126) for the Antarctic Notolepis coatsi that there is an extended backward migration 
of the anus during the transition from the Prymnothonus stage to the adult fish. 
A larva of 12 mm. has the snout moderately produced. There are 80 myotomes 
and about 20 anal rays. The anus corresponds to the twenty-eighth myotome and the 
origin of the anal fin to the fifty-fourth (PI. VII, fig. 1). 
Tropical Atlantic. Station 50. 18° 8., 31° 45' W. Surface. May 7th, 1913. 
A second larva of 16 mm. has the snout more produced than the preceding. 
There are 116 vertebrae (52 + 64) and 30 or more anal rays (PI. VII, fig. 2). 
Tropical Atlantic. Station 47. 20° 30’ &, 36° 30’ W. Surface. May 4th, 
1915. 
In the number of anal rays these examples agree well enough with known species 
of Paralepis, and in the number of myotomes the first agrees with the Mediterranean 
species that I have examined. Possibly P. borealis, a species that I have not seen, 
may have the larger number of myotomes found in the second specimen. 
A third ‘* Prymnothonus” is probably generically distinct from these ; it is a post- 
larval fish, 22 mm. long, evidently related to Paralepis, which it resembles in the 
structure of the head, but it has only 60 myotomes and 11 anal rays. The adipose 
fin is above the posterior end of the anal. Dorsal and pelvic fins are undeveloped 
(PL VIL, fig. 3). 
Station 85. 24 miles W.N.W. from Cape Maria van Diemen, New Zealand. 
2 metres. July 24th, 1911. 
Paralepis speciosus, Bellotti. 
Omosudis elongatus, Brauer, Valdivia Tiefsee Fische, p. 140, fig. 68 (1906). 
This species is represented in the British Museum collection by two examples of 
65 and 75 mm. from Messina. Bellotti’s specimens were 75 and 90 mm., Brauer’s from 
8 to 30 mm., the larger full grown. There is therefore reason to suppose that this 
is a small species, and that it assumes the adult form at an early age. 
A larva of 8 mm. that I refer, with some doubt, to this species has the fin-rays 
not yet developed, but the form of the head is already as in the adult fish. The 
patches of pigment on each side of the gut number only five, instead of eight, but this 
may be a larval character. 
Station 69. 29° 10’ N., 33° 36’ W. Surface. May 29th, 1913. 
This species was described from the Mediterranean (Bellotti, Atti. Soe. Ital. XX, 
1877, fase. 1, p. 2, fig.), and has been recorded by Brauer from the Gulf of Guinea 
and the Indian Ocean. 
MycToPHIDAE. 
Larval and post-larval stages of Myctophum and related genera were taken to the 
north of New Zealand and in the Atlantic. The species of this group are so numerous 
