692 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 47. 



ductive organs. These latter consist of a pair of testes with their 

 deferent ducts, a spermatophore receptacle, and the duct which leads 

 from the latter to the external surface. The testes (t) are relatively 

 large and ellipsoidal in form, and instead of being located between 

 the stomach and the dorsal body wall, as in Achtheres, they are 

 placed below and on either side of the stomach and intestine, nearly 

 in the center of the posterior part of the body. At the posterior end 

 of the testis may be seen the spermatogonia {stg) wdth their large, 

 spheroidal nuclei; passing forward we find the primary and secondary 

 spermatocytes {stc) considerably reduced in size, and finally at about 

 the center of the testis, the spermatozoa {sp). These gradually 

 arrange themselves with their long diameter parallel to the axis of 

 the testis. Toward the forward end where the testis narrows, the 

 spermatozoa are bunched together and pass in this form out into the 

 deferent duct. Around the anterior end of the testis and Uning the 

 walls of the deferent duct are large pear-shaped gland cells {gc), 

 which secrete the material that forms the outer covering of the 

 spermatophores. Around the anterior end of the testis these cells 

 all have their large ends outward and their small ends inward, thus 

 bringing about the necessary reduction in diameter at the opening of 

 the deferent duct. Along the walls of the latter they are more irreg- 

 ular in shape, and are arranged in no definite order. The deferent 

 duct bends completely around as soon as it leaves the testis and 

 passes back just beneath the latter to its posterior end. There it 

 again turns completely around and passes forward, opening to the 

 surface at the tip of the genital process just behind the- second 

 maxillae. In this last section, which may be called the spermatophore 

 receptacle, the gland cells entirely disappear from the walls, and the 

 bunched spermatozoa, already surrounded by the cement substance, 

 are molded into spermatophores {syli). 



Color (preserved material), a dirty white. 



Total length, 1.15 mm. Greatest width, 0.65 mm. 



(rugosus, rough, alluding to the body and neck of the female.) 



Bemarlcs.—This species was fii'st described by Ki-0yer in 1837, and 

 later by Baird (1850), van Beneden (1851), and T. Scott (1900). 



The specimen described and figured by Baird does not agree with 

 the others and certainly was not the present species. Moreover, it 

 was obtained from a different host, "Oadus ceUarius;" the other 

 descriptions agree and the specimens were all obtained from the same 

 host. Scott says of it: 



I find also on the codfish what appears to be the same species of Anchorella. It is 

 evident, however, that these organisms, so far as the British species are concerned, 

 require a more careful study than they have yet received (1900, p. 176). 



After such a study of the specimens in the United States National 

 Museum it has been deemed best to make this species the type of a 



