554 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.39. 



longer, this being but little longer than broad in S. dorsata; the carina- 

 tion of the elements of the IBr series and the lower brachials is not 

 quite so high as in S. dorsata and is more regular, with a more even 

 crest; it is irregular and serrate in profile in S. dorsata. 



S. quinquecostata resembles S. dorsata in having short cirrus seg- 

 ments, but it differs in having a considerably larger number. 



Type.—Csit. No. 27501, U.S.N.M., from station 5275. 



The type has twenty arms; at the same station four smaller speci- 

 mens were secured, with eighteen, seventeen, fourteen, and thirteen 

 arms, the two last being immature. 



Genus PARAMETRA. 



PARAMETRA COMPRESSA (P. H. Carpenter). 



Station 5279. — Two specimens. 



Station 5325. — One specimen with twenty arms 170 mm. long. 



Station 5367. — Five specimens; one has twelve, one thirteen, one 

 sixteen, and two nineteen arms, in the largest 115 mm. long. 



Station 5^11 . — One specimen with fourteen arms 145 mm. long. 



Station 5519. — Two specimens with arms about 160 mm. long. 



Station 5523. — One specimen. 



Station 5536. — Six specimens, all with arms about 150 mm. long. 



In this species the sides of the division series and lower brachials 

 are more or less covered with fine tubercles, and each segment bears 

 a narrow and low, but distinct, carination. 



PARAMETRA ORION (A. H. Clark). 



Between Fracas Reef and Formosa. — Three specimens, all bright 

 yellow. 



This species has the division series invariably smooth laterally and 

 without any median carination. It possesses rather fewer arms than 

 P. compressa and does not reach so large a size. 



Subfamily CHA-RITOIVIKTRIN'^E. 

 Genus PACHYLOMETRA. 

 PACHYLOMETRA SEPTENTRIONALIS, new species. 



A much greater familiarity with the numerous species of this very 

 difficult genus, and especially the acquisition of a fine adult unques- 

 tionably referable to Fachylometra distincta, has shown me that I was 

 in error in referring to that species the Japanese FacJiylometra found 

 by Mr. Alan Owston in Sagami Bay.'* In reality it represents a 

 well-marked new species, which may be described as follows: 



Centrodorsal very rounded, conical, broader than high, the bare 

 polar area very small, 1 mm. in diameter, surrounded by five small 

 radial tubercles; cirrus sockets arranged in ten closely crowded col- 

 umns of two or three each. 



oProc. U. S. Nat. Mus., vol. 34, p. 312. 



