DISCUSSION <>F SPECIES AND THEIR DISTRIBUTION. 401 



[men referred bo the nakedness of the under surface of the head is even more pronounced 

 than in the smaller, in which tlio under surface of the head beneath t i t < - suborbital and nasal 

 ridge is almost entirely naked. The. interm axilla has a very short bone similar in structure 

 and dentition to that of Macrurus Fabricii, that is to say. the intermaxillary teeth are in a 

 rather broad villiform band, and the outer teeth are not enlarged. The mandibulary teeth 

 are in a similar broad villiform band. The mouth is entirely interior and small. The gill 

 membranes are attached across the isthmus and are very little emargiuate and not deeply 

 cleft, in the large example the gill membrane is attached to the isthmus and not deeply 

 cleft, but there is a very narrow l'ree margin behind. 



The gill rakers are very short, tubercular, and few in number, certainly not more 

 numerous than in Fabricii. In the large example only 8 little tubercles can lie seen on the 

 first gill arch. 



Second spine of the dorsal in the type specimen is smooth, with the exception of two 

 weak spines near its tip, but in the large example there is no trace of serrations on the 

 dorsal spine. 



The type specimen (Oat. No. 37334, U. S. N. M.), 450 millimeters in length, was taken 



by the Albatross from station SVM\. in 28° 34' N. lat., 86° 48' W. Ion., at a depth of 335 



fathoms. 



CCELORHYNCHUS CA.RIBB.dEUS, Gooi>e and Beau (Figure 338). 



Macrurus caribTxBus, Goodb and Bean, l'roc. U. S. Nat. Mus., vm. 1885, 594. — GOnther, Challenger Report, 

 xxn, 121, note 3. 



A Ccelorhynchus, in general appearance resembling M. carminatus, from which it may 

 be quickly distinguished by its sharper and longer snout, smaller scales, more advanced 

 second dorsal, and many less prominent characters. The body is normal in shape, its great est 

 height (44 millimeters in the type specimen) contained Gi times in its total length. Scales 

 moderate, strong, densely covered with minute spines, -without enlarged median keel, as in 

 Macrurus fabricii ; 124 in the lateral line, series between origin of dorsal and lateral line, 

 and 15 or 10 series from vent forward to lateral line. The length of the head (07 milli- 

 meters) is contained nearly 4i times in the total length; interorbital area flat, its greatest 

 width (13 millimeters) about 5 times in the length of the head. Postorbital portion of head 

 (21 millimeters) contained about 3 times in its own length, and just as long as the eye, 

 which is oval (its horizontal diameter 21 millimeters), and If as long as its vertical diam- 

 eter (15 millimeters). Snout long, thin, diaphanous, with acuminate point, its general form 

 resembling that of .1/. carminatus. The nostrils are close to the orbit, the posterior ones 

 much the largest. Teeth in both jaws in villiform bands, minute. Barbel slender and 

 short, its length (7 millimeters) one-third that of the eye. The maxillary extends to the ver- 

 tical through the middle of the pupil. Length of upper jaw (19 millimeters) slightly more 

 than 3 times in length of head. Length of mandible (20 millimeters) contained 2i times in 

 length of head. The intermaxillary is a short bone as compared with the maxillary. The 

 miter series of teeth in this bone and the mandible not enlarged, and the teeth not becoming 

 nniserial. The gill membrane is narrowly attached to the isthmus. Gill-rakers minute, 

 tubercular, about 10 on the first arch. The suborbital ridge is very strong, and is contin- 

 ued almost in a straight line by the lateral ridge of the snout. The under surface of the 

 head, except the chin and branchiostegal region, is densely covered with small, spiny tuber- 

 cles. There is a naked space on the under surface of the snout; it occupies almost the entire 

 distance from the front of the month to the tip of the snout; the space is widest anteriorly, 

 l)iit its greatest width is only about one-fifth the length of the snout. The intermaxillary 

 is protractile in a nearly vertical direction, and the month is distinctly inferior and not 

 lateral. 



First dorsal with 2 spines — the first minute, the second smooth, elongate — and 8 

 rays, the last double, inserted at a distance from the snout (72 millimeters) equal to one- 

 fourth of the total length; the second spine (39 millimeters long) reaching the fifth ray of 

 the second dorsal. The length of its base (15 millimeters) equal to three-quarters of the 

 space between the two dorsals. The second dorsal begins in the perpendicular from the 

 l'.iSOS— No. 2 20 



