XKM KRTIXEA BAYLIS. 1 1 ~ 



The unlv other point speciallv observed was the great development, in sonic 

 specimens, of muscle-bundles running through the gelatinous parenchyme in a dorso- 



ventral direction. Tliese innscles pass through the longitudinal iniisele-layer. ami 

 are connected \ v ith the circular muscle-layer dorsally and ventrally. 



1'. . I ui/ill i/mi-il* Hlilltili<lxt<lliix. .louliill. (PI. I. figs. 1. _', f). 7. !). ) 



.liy.A,></-* miiH'ilKitlotii* |Punnett (!,t //.)], .Lmliiii, 111 lo, ],],. 11-12; Tcxt-lius. 1">, HI: 

 PI. T, ti&. 7, 8. 



Stations L'L'O. :', Hi. :;:', I . :;."K; : -JJ -250 fathoms. 



This species appears to lie tolerably abundant in and near McMurdo Sound, li 

 was first recorded from ('ape Adare. in the "Southern < 'ross " collection, and some 

 of the " Terra Xova " material comes from the same locality. The collection contains 

 thirteen specimens ami some fragments belonging to this species. As it has lieen 

 possible to cut some serial sections, and to examine the proboscis carefully, a tew 

 points in the structure of the species, which have not previously Keen described, may 

 now lie noticed, and a fe\v measurements given. 



EXTERNAL FKATT i; KS. 



The largest specimens measure aliout .") cm. in length. Their thickness, according 

 to the state of contraction, is very variable. 



The alimeutarv canal and proboscis-sheath have a common opening on the head, in 

 the form of a median vertical slit (I'l. I. iig. ~2. M.). The external openings of the 

 cei-eliral organs are in the form of crescentic slits, mainly transver.se in direction (PI. I. 

 iig. '_'. C.S. ) Numerous eves were found to lie pre.seut : they are situated rather deep 

 in the sulistance of the head, ami are arranged in two lateral patches (PI. I. tig. 1, E.). 



J NTKKXAL ANATOMY. 



.\/iuii'iitnri/ < 'ii/ni/. The oesophagus is at first (in the region ot the brain) 

 \erv narrow. Soon, however, it expands into a voluminous stomach, with much 

 folded walls. This is succeeded again liv a narrower pyloric canal (PL I. rig. 5, 

 Pyl.) which opens into the mid-gut at aliout 4 mm. (in a spirit specimen, as 

 calculated from serial sections) from the tip of the head. There is a large ca'cum 

 (I'l. I. tiv.. .">. ( ';ec.) extending forwards from this point, ventrally to the pvloric 

 canal, as far as the posterior end of the folded stomach, with which it appears to lie in 

 dose contact. This ca.'ciim sends out numerous lateral pockets (|'|. I. iig. o. L.P.), 

 which curve upwards within the muscles () f the body-wall. 



/'/<ilit>x<-i.t. - The most striking feature of the proboscis in this species, as 

 M. .loiiliin notices, is its vcrv urea! thickness in proportion to the animal's liodv. Its 

 anterior portion is exceedingly muscular, and its diameter is aliout equal to halt that 



