11-1: THE VOYAGE OF H.M.S. CHALLENGER. 



transverse suture, marking oflf a linguiform terminal joint, as in Gnathophausia or 

 Eucopia ; its outer edge is quite straight and naked, terminating in a small dentiform 

 projection, whence the above mentioned suture runs inward. 



Of luminous globules I failed on dissection to detect any trace whatever. True, the 

 late Dr. v. Willemoes-Suhm observes in his manuscript notes having indistinctly been 

 able to trace a number of accessory eyes (Nebenaugen) on the anterior division of tlie l;)ody, 

 .•111(1 lias also represented such organs in his drawing (see woodcut, fig. 4, p. 110) as occur- 

 ring at the bases of all the legs. But, to judge from the place assigned, I feel convinced 

 tliat he has obviously taken for accessory eyes the iucrassated outer lobe of the epipod- 

 plates, these, perhaps, being more vividly coloured than the rest. 



Colour. — According to the manuscript notes of the late Dr. v. Willemoes-Suhm, the 

 whole body of the animal in a fresh state, unlike what occurs in other Euphausiidse, is 

 quite opaque and of a similar vivid-red colour to that in most other true deep-sea 

 Crustaceans. 



Habitat. — The two sjiecimens examined by myself were taken in the following 

 localities: — 



October 1873, off Tristan da Cunha ; depth, 1000 fathoms. 



Station 107, August 26, 1873, Tropical Atlantic; lat. 1° 22' N., long. 26° 36' W. ; 

 depth, 1500 fathoms ; Globigerina ooze; bottom temperature, 37° "9. 



The specimen examined by the late Dr. v. Willemoes-Suhm was obtained south of 

 Australia, in the following locality : — 



Station 158, March 7, 1874; lat. 50° 1' S., long. 123° 4' E.; depth, 1800 fathoms; 

 Globigerina ooze ; bottom temperature, 33° "5. 



As regards distribution, this form, therefore, would appear to inhabit the abysses of 

 the Atlantic and Southern Oceans. 



Genus 4. Nyctiphanes, G. 0. Sars, 1883. 



Nydiphanns, G. 0. Sars, Prelimiiiary Notices ou the Challenger Shizopoda. 



Generic Characters. — General appearance as in Euphatisia. Flagella of both pairs of 

 antennae greatly elongate. Antennular peduncle elongate, cylindrical, stronger in male 

 than in female, basal joint provided above at extremity with a re flexed membranous 

 leaflet. Oral parts and anterior legs very nearly as in Euphausia. Penultimate pair of 

 legs distinctly developed, but differing from the rest in the endopod consisting of two 

 elongate joints only. Last pair of legs quite rudimentary, forming a minute non- 

 articulate and flexuose stem, without any bristles. Last pair of gills rather complex, 

 remaining pairs comparatively simple, main stem expanded at extremity and drawn out 

 as two diverging points. Ovisac double. Luminous globules as in Euphausia. 



Mernarks. — This genus is mainly characterised by the peculiar reflexed leaflet on the 



