Account of the Crustacea and the Pycnogonida. 69 



Of the species mentioned, the only one whose hmbs are figured is 

 Janthe speciosa Bovalhus. This species has been estabhshed on a single 

 large specimen (cJ) and resembles J antra spinosa Harger so closely that 

 H. J. Hansen (West Greenland, 1887, p. 191) unites them into one 

 species. Miss Richardson on the other hand regards them as two species 

 in her Monograph Isop. N. America, 1905, pp. 458 and 460, and writes 

 in addition (ibid, footnote p. 460) "This species {Jolella speciosa) is con- 

 sidered by Hansen and Ortmann to be a synonym of the preceding species 

 {Jolella spinosa). Since my manuscript went to press, the types of /. spi- 

 nosa have been sent me from Yale University, and I find it distinct 

 from /. speciosa.'''' 



I find it unnecessary to give a complete description of the species 

 taken by Dr. Nordmann as all details may be seen in the figures ; only 

 I think that the following characters should be pointed out : — Flagel- 

 lum of first antenna has, in the (J, about 45 joints and in the $ about 

 30 joints; in second antenna the flagellum has about 225 joints. The 

 eyes are oblong as are those in the species established by Harger and 

 by BovALLius, not round as in /. glabra. The length is 14 mm. 



Although on account of the absence of dorsal spines the specimens 

 most resemble /. glabra, yet they cannot be this species ; this belief is 

 based partly on the fact of the eyes being oblong and not round, and 

 partly on the habitat. Jolella glabra has been taken off Gape Hatteras, 

 at 888 fathoms, in blue mud and fine sand, and consequently belongs 

 to the Atlantic-boreal deep-sea fauna. But the species in question was 

 taken in a true arctic locality and the Malacostraca which originate from 

 the same station (see above in the list of the stations) are all good arctic 

 or boreo-arctic species ; at any rate none of them is a boreal deep-sea 

 species (see my zoo-geographical account of the Greenland Malacostraca 

 and Pycnogonida of the Danmark Expedition ; Meddel, om Grønland, 

 vol. 45, 1912, pp. 554 sqq.). 



It is practically impossible that an Atlantic deep-sea species could 

 possibly be found in arctic conditions north of the ridge in Davis Strait 

 and the few cases known to me where this happens with regard to the 

 Greenland Malacostraca and Pycnogonida are the following: — Pan- 

 daliis borealis and Pseudomma partum (Danmark Expedition, 1. с. pp. 566 

 and 579) extend really right into Umanak Fjord; but here the water is 

 not arctic, registering + 1° at the bottom; besides as regards Pandalus 

 borealis, it is extremely eurythermic. Whether this is also true of Pseu- 

 domma parvum cannot be decided now that it is only known from S.W. Ire- 

 land (Tattersall, 1911) as well as from the head of Umanak Fjord. On 

 the other hand Aconthoniscus typhlops has been taken south of the ridge 

 in Davis Strait (63°24' N., 53°10' W.; 892 m.) and west of the Lofoten, 

 consequently, north of the ridge in the Atlantic Ocean (68°21' N., 10°41' 

 E.; 457 fathoms; —0.70°) (Danmark Expedition, I.e. p. 615). Very 

 much the same applies to Janthe laciniata: its West Greenland habitat 



LI. 6 



