On a new West-Indian Tanaid. 49 



Synopsis of Species. 



I. Zooecia visible throughout. 



A. Peristomes high, sharply reflexed spatiosa. 



B. Peristomes low. 

 a. ZocEcia long : 



(1) plain, irregular ; zoarium in-egular compressa. 



(2) plain, regular Sauvagei. 



(3) striated : 



peristomes flush ; zocecia cylindrical .... portlandica. 



peristomes raised ; zocecia fusiform striata. 



h. Zocecia short Allaudi. 



II. Central zocecia seen throughout; peripheral zooecia 



visible only at ends. 



A. Zoarium discoid Archiaci. 



B. Zoarium irregular : 



(1) peristomes low : 



mouth of normal size diluviana. 



mouth small parvitubulata. 



(2) peristomes raised boloniensis. 



III. Zooecia visible only at ends. 



A. Zocecia regularly arranged. 



Zoarium discoid ; peristomes not crowded scobinula. 



Zoarium irregular ; peristomes very crowded . . coartata, 



B. Zooecia 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 ChELIFERA. 



Family Tanaidae. 

 DOLICHOCHELIA, gen. nov. 



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



First antennae very elongate, with the flagellura 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 SoXt;^o?, long, and XV^V] a claw) 

 Ann. d) Mag. N. Hist. Ser. 6. Vol. xvii. 4 



