NO. 6.] ACCOUNT OF THE SPECIES. 79 



Tribe: HETEBABTHRANDRIA. 

 Fam. HETEROCH./ETID,*:. 

 Gen. Heterochceta, Glaus. 



Remarks. Of this genus, established in the year 1863 by Prof. Glaus, 

 6 species are recorded in Dr. Giesbrecht's work, 2 from the Bay of Naples, 

 the other 4 from the tropical parts of the oceans. One of the latter, 

 H. abyssalis, is identified with the form recorded by Prof. Brady from the 

 Challenger Expedition as H. spinifrons, Glaus. A 7th species of this genus 

 was long ago recorded by Boeck from the Norwegian coast, under the 

 name of H. norvegica; but as this species was very imperfectly characterised, 

 its true relation to the other species could not of course be made out by Dr. 

 Giesbrecht, who only mentions it as an undeterminable form. Boeck's 

 species, which I have also observed myself off the Norwegian coast, is one 

 of the most characteristic Galanoids of the Polar Basin, and together with it, 

 I have found another, very distinct, new species. Both these species will be 

 described below. 



17. Heterochceta norvegica, Boeck. 

 (PI. XXIII). 



Heterochceta norvegica, A. Boeck, Nye Stegter og Arter af Saltvandscope- 

 poder. Chr. Vid. Selsk. Forh. f. 1872, p. 40. 



Syn: Heterochceta spinifrons, Moebius (not Claus). 



Specific Characters. Body rather slender, especially in the male, with 

 the anterior division regularly oblong oval in form, and somewhat depressed 

 in its anterior part, front surmounted by a compressed and angularly deflexed 

 rostrum, carrying on the tip 2 long straight styliform appendages; lateral 

 corners of last pedigerous segment rounded off. Tail nearly half the length 

 of the anterior division, genital segment in female very large, with a saddle- 

 like depression dorsally, and considerably protuberant below; left caudal 

 ramus much larger than the right, and about equalling in length the last 2 

 segments combined; the prolonged seta of this ramus exceeding the length 

 of the whole body. Anterior antenna? in female very slender and attenuated, 

 somewhat longer than the body, and abruptly curved near the base; those in 



