ee eS es 
of the Bishery Board for Scotland. 227 
Attheyclla propinqua sp. n. (provisional name), (Pl. VII. figs. 1-11). 
Length, exclusive of caudal sete, ‘7 mm. (,';th of an inch), anterior 
antenne rather longer and more slender than those of Attheyella cryptorum, 
but resembling in this respect those of Attheyella spinosa; the relative 
length of the joints is also somewhat different, as shown by the formula— 
A SMR CAG; PIG Es Grae Te 2k ines 
MAS KPO 26h nk 8, 
The seconilary branch of the posterior antenne is fairly well developed 
and two-jvinted ; the first joint bears one terminal seta, the second joint 
bears two plumose terminal setz and a murginal one. The mandible, 
which is elongate and of moderate breadth, has a small two-jointed palp 
bearing a few sete (fig. 5). Posterior footjaws two-jointed and armed 
with a slender terminal claw ; the first joint is provided, at the inner 
distal angle, with a small spiniform seta. First pair of swimming feet 
short, Inner branch rather longer than the outer, and composed of two 
nearly equal juints (fig. 7). The second, third, and fourth paizs similar to 
those of Atthcyellu spinosa. Fifth pair, especially in the female, some- 
what like those of Attheyella cryptorum ,; those of the female rather 
larger than in that species; the basal joint is broader and subquadrate, 
and provided with shorter sete on the subtruncate end ; the second joint is 
broadly subovate, the outer margin bearing a fringe of cilia in addition to the 
five terminal and subterminal sete. Fifth pair in the male smaller than in 
the male of Attheyella crypturum ; the extremity of the produced inner 
part of the basal joint is subtruncate and provided with two small 
plumose setz, second joint ovate with one moderately long plumose and 
oue short plain terminal svete; there are also two skort plumose sete on 
the inner margin, and three short sete on the outer margin, The second, 
third, and fourth abdominal segments are each furnished with one concentric 
fringe of short prickles close to the posterior margin, instead of two as in 
Attheyella cryptorum. Seen from the side, the abdomen terminates 
abruptly, with the fringed opercular plate projecting slightly upward 
and backward. Th: male differs little from the female: the anterior 
antenne are not so stout as in Attheyella cryptorum, and do not possess 
the strongly developed Jobe-like process, which is such a marked character 
of the male antennze of Attheyella spinosa ; the third pair of swimming 
feet are provided with shorter spines than the third pair of the male of 
Attheyella cryptorum, but are otherwise somewhat similar to those of that 
species ; caudal stylets very short. In bottom material both from the 
head of Loch Morar and from Brinacory. 
The species now described is somewhat intermediate hetween Attheyellu 
spinosa and Attheyella cryptorum, but seems more closely allied to the 
latter ; the three forms when placed together are readily distinguished from 
each other by the form of the abdomen and stylets. In the species now 
described, the abdomen, viewed laterally, is seen to end abruptly, with the 
opercular plate showing as a distinct tooth-like process ; and the abdominal 
segments have only one fringe of sete. In Attheyellu cryptorum, the 
abdomen is more slender and ends much les: abruptly than in the last 
species, the opercular plate is less prominent, and there are two rows of 
setee on each of the abdominal segments ; moreover, the ovisac is somewhat 
larger, so that the sete of the fifth feet do not reach to the end of it asin 
Attheyella propinqua. In Attheyella spinosa the form of the stylets, which 
are larger than in either of the other two species, are very characteristic, 
as are also the curled sete of the fifth feet. Dissection brings out other 
more or less important differences as shown by the description and 
figures. 
