ACANTHOPTERYGII. 
Pisces. 23 
Latrunculus, Grthr., and Crystallogohius, Gill. R. Collett, in a paper 
of special interest, describes minutely the curious group of Gobioids 
which have the body completely transparent. He shows that L.*^albus, 
Parn., L:stnwitzi^ Diib. & Kor,, and L. ^ellucidus, Nardo, are all one 
species, which should be called by the last name, L. albus being the male 
and L. stuwitzi the young fish. In many respects, these fishes are very 
remarkable. They live only* one year, being the first instance of annual 
Vertebrates. L. pellucidas in June and July, the eggs are 
hatched in August, the young are half-grown in September, full-grown 
in October to December. In this stage, the sexes are quite alike ; both 
have very small teeth and feeble jaws. In April, the males begin a 
transformation, the small teeth are lost and replaced by very long and 
strong teeth of quite a different kind, the jaws becoming long and 
strong, and the body much thicker. The teeth of the females remain 
unchanged. In this stage, Parnell described the species from males. In 
July and August, all the adults die off, and in September only the fry 
are to be found. The males of Crystallogobius nilssoni do not change 
their teeth, which are strong from the commencement. The author has 
obtained many specimens of this very rare species in Christiania Fjord, 
and describes the female for the first time; it has the first dorsal, the 
ventrals, and the pectorals almost entirely wanting, and the ovaria 
extend backwards along the anal ; the teeth are absent. Forh. Selsk. 
Chr. 1876, No. 6, pp. 1-41, pis. i. & ii. figs. 1-14. 
Apocryptes madurensis, Day {nec Blkr., renamed bleeheri), p. 300, 
pi. Ixiv. fig. 3, India to Malay Archipelago, and A. batoides, p. 301, 
pi. Ixvi. fig. 3, Moulmein, spp. nn.. Day, op. cit. A. serperaster^ Rich., 
figured, id. 1. c. pi. Ixvi. fig. 2. 
Apocryptichthys, g. n., separated from Apocryptes as having no poste- 
rior canines above the symphysis of the lower jaw, whilst the prsemaxil- 
lary teeth are very elongate ; eyes prominent, and larger than in the 
Amblyopina\ dorsal fins distinct. For A. cantoris., Day (1870) ; id. op. 
cit. p. 302, pi. Ixii. fig. 7. 
Apocryptes brachypterus, Blkr., and A. variegatus^ Peters, redescribed 
as species of Gobiopterus, Blkr. ; Bleeker, Versl. Ak. Amst. (2) ix. pt. 3, 
1876. 
^ Gobiosoma multifasciatuni, sp. n., Steindachnor, op. cit. Ixxiv. p. 231, 
Antilles. 
\/ Latrunculodes, g. n. for Gobius nilssoni, Diib. & Kor. (1844) (see Forh. 
Selsk. Chr. 1874, p. 151), R. Collett, Norges Fiske, p. 60. 
V Gillichtliys mirabilis, Coop., noticed by Steindachner, /. c. p. 195. 
Sicydium. Bleeker redescribes the known species from the Indian 
Archipelago under the generic names Sicyopterus, Gill, Micro sicydium, 
Blkr. {S. gymnauchen, Blkr.), Sicyopus, Gill {S. zosterophorum, Blkr., and 
balinense, Blkr.) ; Yersl. Ak. Amst. (2) ix. pt. 3, pp. 271-289. 
Sicydium fasciatum, Day, figured ; Day, op. cit. pi. Ixiv. fig. 7 . 
Periophthalmus. ‘ Mud-skippers.’ Details of habits ; id. op. cit. 
p. 303. 
Boleophthalmus has the eyes still more prominent in life* than after- 
wards ; id. op. cit. p. 305. B. tenuis, p. 305, pi. Ixv. fig. 1, Kurrachee, 
