340 FRANK E. BEDDARD. 
specific characters, and so the following attempt at generic 
and specific definition must be regarded as only tentative. 
BRANCHIURA, nov. gen. 
Hinder 50—80 segments furnished with a series of branchial 
processes, a pair to each segment, arising one from the dorsal 
and one from the ventral median lines. Sete capilliform and 
uncinate, the former kind only found in the dorsal bundles 
of the anterior segments. An integumental capillary plexus 
present. Atria consisting of a large oval sac enveloped, as 
in Lumbriculide, by a thick layer of peritoneal cells, and of a 
narrow tube leading -to exterior; vas deferens opens at junction 
of glandular and non-glandular part of atrium. 
Branchiura Sowerbyi, n. sp. 
Two pairs of specially dilated hearts in Segments 9, 10. 
Intestine begins in 11; pigmented peritoneal cells appear first 
in Segment 6. 
EXPLANATION OF PLATE XIX, 
Illustrating Mr. Frank E. Beddard’s paper on ‘A New 
Branchiate Oligochete (Branchiura Sowerbyi).” 
Fic. 1.—Branchiura Sowerbyi, nat. size. 4. Larger (sexual) indivi- 
dual. B. Smaller individual, representing the average size. 
Fic. 2.—Branchiura Sowerby}, an individual slightly magnified. 
Fic. 3.—Setez of dorsal bundle. a. Capilliform seta. 4. Uncinate seta. 
c. Sigmoid sete. 
Fic, 4.—Prostomium and three anterior segments. 
Fig.-5,—Branchiz, showing transverse wrinkles due to contraction. Br, 
Dorsal series. Br’. Ventral series. 
Fic. 6.—A single branchia, showing details of structure. c. Cuticle. 
Ep. Epidermis, beneath which lies blood-capillary. 1. Muscular fibrils 
stretching across lumen. WD. “ Diaphragm.” 
