REPORT ON THE CIRRIPEUJA. 81 



prominent ridge. The occludenl margin is straight, and so are the other margins, with 

 the exception of the lateral margin, which is slightly convex. 



The tergum is elongate and triangular. The occludenl margin is slightly convex, the 

 apex a little recurved; the scutal margin is divided into two parts, describing together a 

 very obtuse angle. 



The carina is short, simply bowed; sides almost wanting, only slightly developed in 

 the superior part. There is no flat roof, the valve being distinctly keeled. 



The upper latus is trapeziform. The quadrangular part is enclosed between the 

 scutum, the tergum, and the carina; the undermost and triangular pail betweeD the 

 scutum and the carinal latus. 



The rostrum is very large, much larger than the rostral pair of latera ; it is internally 

 concave and externally carinated ; it is rhomboid, with the umbo at the apex, and 

 resembles much the same part in Scalpellum rostratum. 



The rostral latus is triangular and shorter than the rostrum, which valve it slightly 

 overhangs. 



The carinal latus is quadrangular, rhomboid. It is divided into two triangular parts 

 by a prominent ridge running from the apex. The area of these valves almost equals thai 

 of the rostrum, and surpasses that of the rostral latus. 



The sub-car ina is triangular and rather small. The apex lies over the base ofthe carina. 



Length ofthe capitulum, 5"5 mm. 



The peduncle is narrow, only slightly wider near the capitulum, totally covered by 

 very small scales, the free edges of which are rounded. The rows formed by the scales 

 are not very regular. 



Of one of the specimens I made a preparation of the month, which I figure on PI. VIII. 

 fig. 12. The mouth is not so bullate as in the other species; its opening is directed 

 backwards. The oesophagus is narrow but very long; the supra-cesophageal ganglion 

 is small and situated close to the cardia. The oesophageal commissure is very long, 

 and the first ganglion of the ventral chord is huge, the second a great deal smaller. 



The first cirrus is elongate, its two branches are very unequal in length, but they are 

 both very slender. The longest branch has ten, the shortest, eight segments. The 

 oviduct opens at the base of this cirrus; it has a distinct swelling near its extremity, which 

 no doubt corresponds to the well-known organ containing the so-called auditory sac in 

 Lepas. Within this swelling, in the present species also, a small sac was observed. 



Caudal appendages uniarticulate. 



This curious species was observed at Station 78, July 10, 1873; hit. 37° 24' X. ; 

 long. 25° 13' W. j depth, 1000 fathoms; bottom, Globigerina ooze. Station 170, July 

 14, 1874; hit. 29° 55' S., long. 178° 14' W.; depth, 520 fathoms; bottom temperature, 

 6° C. ; bottom, rocky. Lat. 29° 45' S., long. 178° 11' W. ; depth, 630 fathoms ; bottom 

 temperature, 4° C. ; bottom, rock}-. 



(ZOOL. CHAIX. EXP. — PART XXV. — 1883.) Bb 1 1 



