270 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



Two of the specimens (Cat. No. 17931, U.S.N.M.) were obtained 

 between Panay and Negros at station D. 5185, 10° 5/8 north and 

 122° 18/5 east, on March 30, 1908, at 5.26 in the afternoon, by an 

 open 0000 grit-gauze net towed horizontally for 20 minutes in 550 

 fathoms. The third specimen (Cat. No. 17930, U.S.N.M.) was 

 obtained in the China Sea in the vicinity of Formosa, at station 

 D. 5319, 21° 31' north and 117° 53' east, on November 5, 1908, at 

 7.23 in the afternoon, by the same net towed for 27 minutes in 20 

 fathoms. 



COMPARISON OF PHILIPPINE CHAETOGNATHA WITH THOSE FROM 

 THE SAN DIEGO REGION. 



Aida (1897) describes 10 species from Misaki Harbor, Japan, of 

 which all except S. regularis and S. Mspida ( = S. robusta Doncaster) 

 are represented in the Philippine collection. Again, Doncaster 

 (1902) records 10 species from the Maldive Archipelago, of which all 

 save S. regularis and S. Mspida are present in the Philippine material. 

 Likewise, Fowler (1906) describes 14 species from the "Siboga" 

 area, of which all save S. regularis and S. Mspida have been taken 

 from the Philippines. Lastly, Ritter-Zahony (1910) lists 10 species 

 from Sharks Bay, Australia, of which all except S. regularis and S. 

 bipunctata are represented in the Philippine collection. The only 

 species obtained from the Philippines which are not recorded from any 

 of these regions are S. pMlippini and E. richardi, the former a new 

 species represented by a single individual, and the latter a rare 

 species represented by only five specimens. Obviously these facts 

 strongly point toward a uniformity in the chaetognath fauna, espe- 

 cially the epiplankton, over the Indo-Pacific Ocean, notwithstanding 

 the curious absence of S. regularis and S. Mspida in the Philippine 

 collection. 



The situation is quite otherwise when the Philippine chaetognatha 

 are compared with those from the San Diego region, for those species 

 most characteristic of the Philippines are those that are either 

 absent or least characteristic of the San Diego region, and the op- 

 posite. Thus, S. enflata, by far the most typical and abundant 

 species about the Philippines, has been obtained in the San Diego 

 region by less than 20 out of nearly 4,000 hauls. Conversely, S. 

 bipunctata is by far the most typical and abundant species in the 

 San Diego region, but not a single individual was obtained from the 

 Philippines. Again, Sagittaferox, S. pulchra, S. bedoti, S. decipiens, S. 

 minima, S. macrocephala, and Eulcrohnia richardi have not been taken 

 from the San Diego region, although the first three are third, fourth, 

 and sixth in order of abundance in the Philippine region. On the 

 other hand, Sagitta lyra and S. californica, in addition to S. bipunctata, 

 were not taken from the Philippine region, although the former is 



