E. B. Wilson — Pycnogonida of New England. 
the legs often blackish near their extremity. Length 16 millimeters; 
extent 38 millimeters.* 
This species has a wide range. Phillippi records it from Naples, 
and it appears to be common along the whole northern coast of 
Europe. Tn the Bay of Fundy it is common under stones at or near 
low water mark, and also in deep water. Four specimens were 
dredged in 1872, by Smith and Harger, in 430 fathoms, east of St. 
George’s Bank, N. lat. 41° 25'; W. long. 65° 42*3'. It occurs in the 
Gulf of Maine, and on Le Have Bank, off Nova Scotia, where it was 
frequently found clinging to the lower side of the large actinia, 
Bolocera Tuedice , upon which it is probably parasitic. A single small 
specimen was dredged by the II. S. Fish Commission in 1874, in 50 
fathoms, off Race Point Rock, in Long Island Sound, with young 
Nymphon grossipes. The females are less common than the males; 
the eggs are carried upon the accessory legs in a single large flat mass, 
which covers nearly the entire ventral surface of the body. 
Dr. P. P. C. Hoek states in a recent paper (Niederlandisches Archiv fur Zoologie, 
Band iii. Drittes Heft. p. 244) that he found adult male specimens with accessory legs, 
and females in which they were completely wanting. It seems hardly credible that 
this observation is correct. In a large series of specimens I have been unable to find 
the least indication of a transition between those forms Avith accessory legs and those 
without them, among adults, though young females present all stages, as also observed 
by Hoek. The sperm cells may readily be mistaken for undeveloped ova, as I have 
observed in several other species. 
Family II, Aohelid.e. 
Tanystlyum Miers. 
Body broad and stout. Antennae rudimentary, one-jointed. Palpi 
six-jointed. Accessory legs ten-jointed, present in both sexes. Legs 
stout, dactylus with auxiliary claws. 
Tanystylum orbiculare, sp. nov. 
ft Pasithoe umbonata Gould, Proc. Bost. Soc. Nat. Hist., vol. i, p. 92. 
Pallene. sp., Smith in Report on the Invertebrate of Vineyard Sound, p. 250 (544). 
Plate II, figures 2 a to 2 f. 
Body orbicular, deeply incised between the lateral processes, which 
are inclose contact. Oculiferous segment extremely broad, neck not, 
evident. Oculiferous tubercle large and rounded. Eyes black. 
* The length includes the rostrum and abdomen. The extent is the distance from 
tip to tip of the outstretched legs. 
