GXATIIOPHAUSIA GRACILIS. 185 



Distribuiion. — Accordini;- to the literature this species is known IVoin ofT 

 the West coast of Africa, "Laos," fioiu llu- (lulf of Mexico, the Bay of Bengal, 

 the Arafura Sea, South of Mindanao, the Hawaiian Islands, and is coinmon in 

 the California iv^ion in the East Pacific. 



3. Gnathophausia gracilis WiixEMoijs-SiriiM. 



1875. Gnalhoplianxid (jracilis Willemoes-Suhm, Trans. Linn.Soi'. Ijomloii, scr. 2, 1, p. 3.'!, j)!. 9, fiK- I. 



1885. Gnathop)i(iu.iiii gracilU G. O. Sars, Challenger Rept., 13, p. 48, pi. 7, figs. 6-10. 



1891. Gnalhophiiiisin hrevispinis Wood-Ma.son & Alcock, Ann. Mag. Nat. Ili.st., ser. (J, 7, p. 269. 



1895. Gnalhophiiusia hrcritspinis Faxon, Mem. Mus. Comp. ZoiJl., 18, p. 21(1, pi. .1. 



190(). Gnalhophtnisid (jrarUis Oktmann, Proc. U. S. Nat. Mus., 31, p. 39. 



Sta. 4651. Nov. 11. 1904. Lat. 5° 47.1' S., long. 82° 59.7' W. 2222 fnis., trawl. 1 specimen. 



8ta. 4652. Nov. 11, 1904. Lat. 5° 44.7' S., long. 82° 39.5' W. 400 fms. to surface. 1 small specimen. 



Sta. 4656. Nov. 13, 1904. Lat. 6° 54.6' S., long. 83° 34.3' W. 2222 fms., trawl. 1 specimen. 



Sta. 4709. Dec. 30, 1904. Lat. 10° 15.2' S., long. 95° 40.8' W. 2035 fms., trawl. 1 specimen. 



Sta 4715. Jan. 2,1905. Lat. 2° 40.4' S., long. 90° 19.3' W. On way up from 1743 fms. 1 specimen. 



Remarks. — The largest specimen, a male from Sta. 4709, is G9 mm. long; 

 a female with the marsupium well developed (from Sta. 4656) is 65 mm. long, 

 and another female with marsupium (from Sta. 4715) is 62 mm. These three 

 large specimens have on the gastric area an oblong, rather high, lamellar, sub- 

 triangular, dentate crest terminating in a spiniform process; besides they have 

 the lateral plates of the five anterior abdominal segments expanded posteriorly; 

 the expansion of the plates of first segment is small in the two females, moder- 

 ately large in the male, antl the expansions increase in all three specimens 

 gradually and considerably in size from first to fourth segment, while those of 

 the fifth segment are somewhat smaller. In the smallest specimen, measuring 

 25 mm., the anterior dorsal spine on first abdominal segment is extremely small, 

 the lateral plates of the abdominal segments are not expanded posteriorly, 

 and the lamellar crest on the gastric area is rudimentary with a small spine 

 above; in the fifth specimen, which is 37 mm. long, the last-named lamellar 

 crest is developed nearly as in the large specimens, but the lateral plates of the 

 second to the fifth abdominal segments are very feebly expanded. 



I have examined the type-specimen of Willemoes-Suhm and G. O. Sars; 

 it measures 41 mm. and is preserved in the British Museum. It has on the 

 gastric region a small, oblong, triangular, lamellar plate with a spine on the 

 vertex and a little farther behind there are four small saw-like teeth in a longi- 

 tudinal row; furthermore the lateral plates of the abdominal segments are 

 feebly expanded nearly as in the above mentioned specimen measuring 37 mm. 

 Dr. Alcock loaned me the type of G. brevispinis, and an examination gave the 



