308 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [84] 
103. MONOCHIRUS MINUTUS. 
Monochirus minutus Parnell, Mag. Zool. and Bot., i, 527, 1837. 
Solea minuta Giinther, iv, 470. Steindachner, Ichth. Berichte, vi, 1868, 61. 
Habitat.—Me diterranean Sea. 
We know nothing of this species. According to Dr. Day, it is iden- 
tical with Monochirus luteus. Steindachner, however, regards the two 
as distinct, and describes MW. minutus as having 112 to 118 scales in the 
lateral line—a number nearly double that found in his specimens as 
well as in our specimens of M. luteus. If this count is correct, the two 
species must be different. 
104. MONOCHIRUS HISPIDUS. 
Pleuronectes pegusa Risso, Ichth. Nice, 1310, 310 (not of Lacépéde). 
Monochirus hispidus Rafinesque, ‘‘Précis des Découvertes 1814” (fide Bonaparte, Cata- 
logo Metodico, 1845, 50). 
Solea monochir Becnpante, “Fauna Italica,” about 1840. Giinther,iv, 470, 1862. 
Habitat.—Mediterranean Sea. 
Our specimens of this curious species are from Palermo and from 
Venice, the former collected by Professor Doderlein, the latter by Dr. 
Jordan. 
Genus XLI.—ACHIRUS. 
Achirus Lacépéde, Hist. Nat., Poiss., iv, 659, 1803 (fasciatus, etc.). 
Achirus Cuvier, Régne Animal, 1828, (restriction to fasciatus, etc.). 
Trinectes Rafinesque, Atlantic Journal and Friend of Knowledge, i, 1832 (scabra). 
Grammichthys Kaup, Wiegmann’s Archiv, 1858, 94 (lineatus, fasciatus) (Achirus being 
restricted to Pardachirus barbatus, etc.). 
Monochirus Kaup, 1. ¢. (maculipinnis). 
?Aseraggodes Kaup, 1. ¢., 1858, 103 (quttulata). 
Baiostoma Bean, Proc. U. S. Nat. Mus., 1882, 413 (brachiale). 
Bezostoma Jordan & Gilbert, Syn. Fish. N. A., 1882, 965 (amended orthography). 
TYPE: Achirus fasciatus Lacépéde. 
This strongly-marked genus contains numerous species, all very 
closely rélated, and nearly ali American. It has been united by Dr. 
Giinther with Solea, but apparently for no good reason, as the number 
of vertebre is very much less than in the European soles, and the right 
ventral fin is decurrent along the abdomen and united with the anal 
in the American soles, while it is short and wholly free in all the Eu- 
ropean forms. It is also worth noticing that the name Achirus is prior 
in date to that of Solea. The species with rudimentary pectoral fins 
have been set apart by Dr. Bean to form the genus Baiostoma, but the 
very slight development of these organs in some of the species, and the 
evidently very close relationship of them all, leads us to regard Baios- 
toma as a subgenus only. If we follow Kaup in restricting the name 
Achirus to the Asiatic group called Pardachirus, the present genus 
would receive the name of Trinectes. It seems to us that both Lacépéde 
