Figure 18. — AristostortAas scintillans, adult, ca. 280 mm. SL, station 20.40, B50O3. 



BATHYLACONIDAE 



60. Bathylaco nigricans Goode and Bean. 



Figure 19. 



86.92, 06303, (1) 244 mm. 



The four previously known specimens of this 

 rare isospondylid (including Macromastax gym- 

 mis Beebe) were compared by Maul (1059:1-8). 

 G. E. Maul has lent us another specimen taken off 

 Madeira. Of the six specimens known to us, four 

 are from the North Atlantic, and the other Eastern 

 Pacific specimen is from off Colombia. The two 

 Pacific specimens differ slightly from the Atlantic 

 specimens, but all appear to be conspecific. The 

 specimen taken with the Cobb trawl from about 

 305 km. (190 miles) SSW. off Point Conception, 

 Calif., is the largest. known. 



GIGANTUROIDEA 

 GIGANTURIDAE 



61. Bathyleptus lisae Walters. 



Figures 20 and 25C. 

 86.92, 0)303, (1) 182 mm. 



This is one of the larger and better preserved' 

 specimens of this species that has been taken (V. 

 Walters, personal communication). Alive when 

 it came on deck in the trawl, it bit the junior au- 

 thor on the finger. Despite a number of trench- 

 ant morphological differences (that may have an 

 ontogenetic basis), there are certain similarities 

 between this species and Bosaura rotunda Tucker 

 that suggest that they may have at least an intra- 

 subordinal relationship. 



LYOMERI 

 MONOGNATHIDAE 



62. Monognathus sp. 

 60.140, H6204, (1) 51.5 mm. 



This specimen, from about 630 km. (390 miles) 

 WSW. of San Francisco, Calif., is probably one of 

 the largest specimens of this little known group to 

 be recorded; the intrageneric relationships are un- 

 certain, and this specimen is therefore best not 

 identified to species (G. L. Orton and R. H. Rosen- 

 blatt, personal communications). 



654 



Figure 19. — Bathylaco nigricans, 244 mm. SL, station 86.92, C6303. 



U.S. FISH AND WILDLIFE SERVICE 



