202 EXPEDITION OF THE "ALBATROSS," 1899-1900. 



processes thin. Vessels carrying muscles running down into this thin 

 test, PI. I, fig. 1. 



Test 3 mm. thick, gelatinous, transparent. 



Zooids visible through the test, numerous, much flattened laterally, all 

 placed with the dorsal edge toward the common opening of the colon}', the 

 larger zooids averaging 2 mm. long by 3 mm. broad. Young zooids and 

 buds thickly scattered among the older zooids, PI. I, figs. 2 and 3. 



Mantle delicate. Muscles of the prebranchial zone well developed, espe- 

 cially one immediately above the peripharyngeal band. Atrial sphincter 

 strong. 



BrancJilal Apparatus. Branchial orifice at the base of a process of the 

 test which curves over it, on the side toward the open end of the colony. 

 Ventral tentacle present, also about twelve others ; these slender and 

 irregularly placed, varying in number and size in zooids of different ages. 

 Branchial sac, with usually 20-26 stigmata on each side; 16 longitudinal 

 bars on each side. Endostyle large, strongly curved. Dorsal languets, 

 about six in number, very slender. Peripharyngeal band delicate, limbs not 

 meeting on the dorsal side, but the two turning back and forming a broad 

 angle, within which the dorsal tubercle is situated. 



Ganfflion large. Gland conspicuous ; its duct long and bent near the 

 middle; opening circular. Phosphorescent bodies large and prominent in 

 the young zooids, becoming less conspicuous in the older ones, the cells 

 compcsing them apparently decreasing in number and becoming somewhat 

 scattered. 



Difjestlve tract compact. Oesophagus short, funnel-shaped, entering the 

 stomach near its middle. .Stomach nearly globular. Rectum bent sharply ■ 

 back immediately on leaving the stomach and remaining parallel to it, 

 Pi. I, fig. 4. 



Atrial cJiamhcr small. Atrial orifice large, circular, furnished with a 

 single tentacle on its dor.sal edge ; this tentacle long, somewliat llattened, 

 abruptly tapering to an acute point, PI. I, fig.s. o and 7. 



Gonads not seen. 



Bads. Every large zooid provided with a stolon bearing three buds, 

 the largest of the buds with stolon widl di'veloped before it breaks loose 



