558 rROCKEDINdfi OF THE X.IT/OXAL MUl^EUM. 



Family HERPOBDELLIDiE. 



DINA R. Blanchard. 

 20. DINA ANOCULATA, new species. 



Behind the genital region the body is much fhittened, and both width 

 and depth remain nearly constant from tlie cliteUum nearly to tlie pos- 

 terior sucker. Toward tlie posterior end it becomes slightly narrower, 

 and then the margins approach in a curve and pass into the broad 

 acetabular ])edancle. The niaigins of the body are rather obtuse, 

 except on this posterior curve, where they are sharp and coinjiressed. 

 The acetabulum is small, less than one-half tlie greatest width of the 

 body, and faces ventrad. From the genital region the body decreases in 

 breadth anrl increases in relative depth toward the anterior end, which 

 is quite terete. The mouth is very large, the ojiening in the individual 

 measured being nearly, if not quite, I millimeter. It is round and, 

 owing to the shortness of the prost^nniiim, scarcely oblique. It is 

 bounded by th(} i)rostoniium, the first and second annuli. 



The prostoniiiim consists of a larger lip and a nairower posterior 

 incomplete annulus. it presents a median lobe beneath, bounded by a 

 l)air of sulci, 'i'herc are in all one hundred and five aiinuli behind the 

 prostomiuni. The second one is complete and bounds the mouth pos- 

 teriorly; its free margin is crenulated. The first three somites consist 

 of a single annulus each, the fourth and fifth of three annuli each, while 

 somites VI to XXIII aie complete, cf)iisisting of five annuli each. In all 

 of these the third or middle annulus is enlarged, and shows evidences of 

 subdivision into two tertiary annuli, though this character is less obvi- 

 ous than in 1). fjuadristriata. The annulus anterior to the male pore, 

 and occasionally other annuli, show a similar biannulation. Somite 

 XXIV has three annuli, and XXV and XXVI one or incompletely two. 

 The anus is situat«d between somites XXIV and XXV, or annuli one 

 hundred and two and one hundred ami three. 



The male jiore lies between annuli thirty-four and thirty-five (somites 

 X and XI). It is a consi)icuous o])ening, surrounded by a circle of 

 paj)illa;, situated at the summit of a i)rominent, broadly (tonical eleva- 

 tion which affects three annuli in front and as many behind. Annulus 

 thirty-four is biannulate. The inconspicuous female pore is situated 

 between annuli thirty six and thirty-seven. 



The ground color of alcoholic specimens is dull yellow, immaculate 

 below and on the margins, but largely replaced above by four longi- 

 tudinal stripes of grayish or dull black, of which the outer pair are sub- 

 marginal, duller in color, and narrower than the more distinct inner 

 pair, which are well separated by a median stripe of the ground color. 

 Anterior to the clitellum the two stripes on each side become confluent, 

 but at the same time more diluted with the ground color, and finally 

 Inoken and re[)laced by the widening middle stripe. This anterior 

 expansion of the median stripe is clear yellow and p(;culiar in the dis- 

 tinctness with which the longitudinal muscle fibers are there visible. 



