16 MR. E. J. MIEES ON THE IDOXEIDJE. 



megalura of Sars can be regarded as of specific importance. In 

 most of the specimens I refer to Q. Scibini the greatest width 

 of the terminal postabdominal segment slightly exceeds half its 

 length. 



The materials at my disposal are insufficient to determine the 

 geographical range of this species, which, like the preceding, 

 appears to be confined to high Northern and Arctic latitudes. 

 There are in the collection of the British Museum an adult male 

 from Davis Straits (Dr. Sutherland), in which, as the specimen 

 is preserved in spirits, I have been able to ascertain that the 

 styliform appendages of the second pair of postabdominal appen- 

 dages are fully developed; a smaller male from the Haslar Hospital 

 Collection, also Avith fully-developed stylets; two adult males 

 from E-epulse Bay, N. America (Dr. Eae, preserved dry) ; also 

 an adult female with fully-developed incubatory pouch, from 

 Eiscoe (Disco ?), Davis Straits, collected in lat. 67° 10' N". 



A specimen whose particular locality is unfortunately unknown, 

 but which was contained in a jar with other species supposed to 

 come from some point on the "W. coast of N. America, also pro- 

 bably belongs to this species ; but the epimera of the second to 

 fourth segments are not so deep in proportion to their length as 

 in the other examples. 



A young example obtained near Picton Eock Grlacier (Dr. 

 Sutherland) resembles the adult in the general outline of the 

 body ; the epimera of the three posterior thoracic segments, how- 

 ever, are somewhat slenderer and more elongated. There is an 

 open notch at the sides of the head. The joints of the peduncle 

 of the antennae are dilated, as in the adult ; those of the flagellum 

 are not distinguishable. Length -^-^mcYi (ISmillim.); greatest 

 breadth about Smillim. Its slenderer and more elongated form, 

 and the dilatation of the peduncular joints of the antennae, thus 

 clearly distinguish this species, even in its young condition, from 

 G. ccecus. (See Plate I. fig. 2 b.) 



Glyptonotus Sabini occurs in a subfossil state in Greenland, 

 according to Prof. S. Loven (see Nordenskiold in Arctic Manual, 

 p. 410, 1875). 



It is not improbable that many of the earlier writers may have 

 confounded this species and G. entomon, or referred to G> Sabini 

 under the Linnean name. 



I refer the Museum specimens with some doubt to Kroyer's 

 species, because in bis diagnosis he makes no mention of that 



