16 ME JAMES RITCHIE 



Gonosome. — On one specimen were found two clusters of gonangia, the larger 

 measuring 5 mm. in lengtli by 3 mm. in diameter, the smaller 5 mm. by 2 mm. The 

 clusters or coppinise form elongated ovals surrounding the stem and the bases of 

 branches in the neighbourhood. They consist of numerous gonangia so closely packed 

 that the sides become compressed and the whole assumes a honeycomb-like structure 

 consisting of a dense mass of polygonal, usually hexagonal, cells, the majority of which 

 communicate with the exterior by an exceedingly short tube. Issuing from this 

 gonangial cluster are frequent tubes of various shapes ; a few, especially at the ends, 

 are merely two-jointed tubes like cauline nematophores with their basal joint 

 elongated, while the majority consist of a longer tube 1 mm. in length bearing alternate 

 biserial nematophore-like l)odies identical in structure with the nematophores on the 

 trophosome. 



Locality, etc. — Growing on the axis of an Alcyonarian (Gorgouid), and dredged off 

 Gough Island, lat. 40° 20' S., long. 90° 56' W., at a depth of 100 fathoms. Date, 

 22nd April 1904. 



The colonies were growing on the horny axis of a Gorgonid Alcyonarian, and 

 appear to have been lying untenanted for some time, for not only has the coenosarc 

 almost wholly disappeared, but foraminifera frequently occur within the hydrothecse, 

 while barnacles and polyzoa, including a beautifully ringed, snake-like form, Anguinaria 

 spatidata — a rare British species — occur growing on the colony. 



Family Sertulariid^. 

 Sertularella arborea, Kirchenpauer, 1884. 



This species is represented by some colonies growing on lamellibranch shells, the 

 largest reaching a height of 8 cm. The specimens possess the characteristics described 

 by Hartlaub (1900) : — Compound stems and branches ; branches pinnate and alternate, 

 arising beneath a hydrotheca and divided by slanting nodes into very short, stout 

 internodes, each of which bears a hydrotheca ; hydrothecse adnate for about two-thirds of 

 their length, with walls of unequal thickness and hints of intracalycine teeth ; margin 

 divided mto four smcdl, equal teeth. Gonotheca very long (about 3 mm.) and narrow, 

 often smooth, sometimes with faint signs of ringing, usually bearing at the distal end 

 four minute teeth, and always arising from between the internode and the side of the 

 hydrotheca near the margin. The specimens show no variations which have not been 

 noted by Hartlaitb (1900). 



Locality, etc. — Entrance to Saldanha Bay, Cape Colony; 25 fathoms. Date, 21st 

 May 1904. 



Sertularella contorta, Kirchenpauer, 1884. 



Several specimens of this species have been obtained from two localities. They are 

 bushy colonies reaching to a height of slightly over 7 cm., almost destitute of branches 



(ROT. SOC. EDIN. TRANS., VOL. XLV., 534.) 



