On a new West-Indian Tanaid. 49 



Synopsis of Species. 



I. Zooecia visible throughout. 



A. Peristomes high, sharply reflexed spaiiosa. 



B. Peristomes low. 



a. Zooecia long : 



(1) plain, irregular ; zoarium irregular compressa. 



(2) plain, regular Saiwagei. 



(3) striated: 



peristomes flush ; zooecia cylindrical .... portlandica, 

 peristomes raised ; zooecia fusiform striata. 



b. Zooecia short Alluudi. 



II. Central zooecia seen throughout; peripheral zooecia 



visible only at ends. 



A. Zoarium discoid Archiaci. 



B. Zoarium irregular : 



(1) peristomes low : 



mouth of normal size diluxnana. 



mouth small parvitubulata. 



(2) peristomes raised boloniensis. 



III. Zooecia visible only at ends. 



A. Zooecia regularly arranged. 



Zoarium discoid ; peristomes not crowded scobinula. 



Zoarium irregular ; peristomes very crowded . . coartata. 



B. Zocecia irregularly arranged. 



Zoarium discoid verrucosa. 



Zoarium irregular exilis. 



VI. — A new West-Indian Tanaid. 

 By the Rev. Thomas R. R. Stebbing, M.A., F.L.S. 



[Plate IV.] 

 ISOPODA CHELIFEKA. 



Family Tanaidae. 

 Dolichochelia, gen. uov. 



The eye-lobes not soldered to the head ; the eyes pigmented. 



First antennas very elongate, with the flagellum multi- 

 articulate, not hirsute. 



Masticatory organs in the male obsolete. 



First gnathopods of the male chelate, having the three 

 basal joints short and little tumid, while the following three 

 are extremely elongated and rather slender. 



Uropods biramous, the outer branch minute but distinctly 

 two-jointed, the inner multiarticulate. 



The name (formed from 8o\i-%6s } long, and xv^-Vj a claw) 

 Ann. & Mag. N. Hist. Ser. 6. Vol. xvii. 4 



