234 PAPERS FROM TORTUGAS LABORATORY vol. xxxiv 



closely related to Microgobius signatus; and with M. signatus Xenogobins weberi 

 seems identical. 1 W. H. L. 



Microgobius microlepis Longley and Hildebrand 



Microgobius microlepis Longley and Hildebrand, Carnegie Inst. Wash. Pub. 517, 1940,. 

 p. 257, fig. 17 — Tortugas, Florida. 



Family ECHENEIDAE. Remoras 



Echeneis naucrates Linnaeus 



Locally more common than Remora remora. It accompanies sharks and Jew- 

 fishes, and it also has been seen clinging to Sparisoma distinctum and S. viride, 

 to Caranx ruber, and to Diplodus holbrookj, whose length may be no more than 

 twice its own. To some of these smaller "hosts" it seems an annoyance of which 

 they may attempt to rid themselves by rubbing their sides against the bottom. 

 But without loosing its hold the sucking fish evades the danger by simply shift- 

 ing its position as the host's body turns downward. Even when it leaves the host 

 it appears to have no difficulty in returning to it. 



Greenish above and below; side with a white-margined dark brown stripe 

 running from tip of lower jaw through eye to base of caudal fin, on which it 

 expands to cover the greater part of its surface; ocular parts of this stripe con- 

 tinued on anterior and posterior surfaces of eye not exposed in rest; origins of 

 dorsal and anal fins practically opposite each other, the fins of nearly the same 

 size and shape. When this remora clings to its host by its sucking disk it holds 

 its ventral fins closely apposed to each other and to its body, where they form a 

 median dark patch against the lighter background. These peculiarities make it 

 appear as if its ventral side were uppermost, when the reverse is true. When the 

 fish swims the case is aggravated because in the virtual absence of countershading 

 the ventral side may seem nearly black, although it is actually no darker than 

 the dorsal surface. 



All warm seas, northward to Massachusetts. W. H. L. 



Remora remora (Linnaeus) 



Only 2 individuals were taken. These were secured with 2 specimens of 

 Echeneis naucrates, all removed from an 11-foot tiger shark. 

 All warm seas, northward to Massachusetts. W. H. L. 



Family CALLIONYMIDAE 



Callionymus agassizii Goode and Bean 



One of the commonest of bottom fishes south of Tortugas at depths of 80 to 

 100 fathoms, where the largest specimen taken was 220 mm. long. It spawns in 

 the middle of July. 



1 Although Dr. Longley did not say so, he examined the type of Xcnogobms weberi in 

 Amsterdam, and made several notes. — S. F. H. 



