ART. 3. NEW SPECIES OF FISH—WELSH. 3 
Family STOMIATIDAE Gunther. 
Stomiatidae GUNTHER, Cat. Fish Brit. Mus., vol. 5, 1864, p. 424. 
Genus ARISTOSTOMIAS Zugmayer. 
Aristostomias ZUGMAYER, Bull. Ocean. Inst. No. 253, 1913, p. 1. 
ARISTOSTOMIAS TITTMANNI, new species. 
One example, 46 mm. in length, from Station 10161, 115 miles 
east from Cape Hatteras, at a depth of 100 to 0 meters. 
This species appears to agree closely with the rather meager 
description of A. grimaldii Zugmayer,? but differs markedly in one 
respect. A. grimaldii is described as having a large preorbital light 
organ, as well as a suborbital organ. In A. tittmanni there is no pre- 
orbital organ. There is also a large ovoid light organ lying in a slit- 
like socket behind and below the level of the eye. There appear also 
Fig. 2.—ARISTOSTOMIAS TITTMANNI, NEW SPECIES. 
to be minor differences. The description of A. grimaldi does not 
mention the lateral series of photophores.? 
Dorsal, 22; caudal, 22; anal, 24; ventrals, 6; pectorals, 3, 5, or 8 
(according to interpretion of the structure of the rays). 
Head 3.40 (3.83 in total length), long, compressed, its width 3.43, 
its depth 1.85 in its length; body rather short, compressed, greatest 
depth 6.80 (7.66 in total length); eye subovate, lateral 6.66 in head; 
snout acute, projecting, 3.43; mouth deeply cleft; gill opening 
extending to a point above eye; maxillary 1.12, extending about 3 
2Bull. Inst. Ocean., No. 253. 
3 Attention should be directed to the rather close relationship of this species and Grammatostomias 
dentatus Goode and Bean, (Oceanic Ichthyology, 1895, p. 110, fig. 183). A comparison of the types 
reveals the following essential differences: 
a, The greatest depth of the body in G. dentatus is nearly equal to the length of the head; in A. 
littmanni it is only about half the length of the head. 
b. In G. dentatus the eye and snout are of about equal length, while in A. tittmanni the eye is only 
about half as long as the snout. This is important, since the type of A. tiftmanni is only 46 mm. long, 
while that of G. dentatus is 160 mm.in length. The difference in the size of the eye, therefore, can not 
be ascribed to age. 
c. The ventral fins in G. dentatus are inserted notably nearer the tip of the snout than the base of the 
caudal. In A, tittmanni these fins are placed much nearer the base of the caudal than the end of the 
snout. 
d. The arrangement of the photophores on the two types is very different. In G. dentatus they are 
in regular and continuous series and not in groups, as shown in the figure of A. tittmanni. 
