POLYCH/ETA 303 



ventralia. The last plain scutum corresponds with the seventh pair of tori ; the 

 rest are subdivided, terminating after the eleventh tori. The subdivided scuta are 

 dark-coloured. The three pairs of branchiae are subequal. 



(2.) Two more small worms which I assign to this species were taken from the 

 South-west Cheval Paar. These also have five pairs of tori behind the scuta, but 

 the junction of the undivided and subdivided (or anterior and posterior) scuta occurs 

 at the level of the eighth tori, clearly so in one, approximately so in the other 

 specimen. One has 52 segments with a length of 36 millims., the abdominal 

 segments being closely compressed ; the other has about 64 segments with a length 

 of 45 millims. Uncini from the first torus 6-dentate, from the third also 6-dentate ; 

 fi'om the fifth 5-dentate ; from the biserial tori and abdominal pinnules 4-dentate. 

 Part of a tube is encrusted with small shell-fragments of various sizes. 



(3.) There are two other well-preserved worms taken from the Aripu Coral Reef, 

 which afford the peculiarity of an accessory or eighteenth pair of capillary fascicles. 

 The uncinigerous tori which accompany these fascicles are narrower than the pre- 

 ceding, thus affording a graduated transition from the tori to the pinnules. This is 

 particularly so in one of the specimens where the accessory tori are much narrower 

 than in the other. The tubes constructed by these worms are encrusted with coarse 

 sand-grains with a scanty admixture of calcareous fragments. 



The scuta ventralia are much narrower than in the first or typical variety, an 

 appearance which may be partly due to the state of protraction of the body and the 

 method of preservation (Plate VI., fig. 156). On account of this fact, together with 

 the difference of the tubes and the presence of eighteen pairs of capillary fascicles, I 

 will call this variety angustescutata , in order to facilitate future reference. The 

 uncini from the first torus are mostly 6-dentate (Plate VI., fig. 157), the sixth tooth 

 frequently reduced and sometimes obsolete ; in the fourth torus the uncini are 

 5-dentate (Plate VI., fig. 158); from the biserial tori and abdominal pinnules, 

 4-dentate (Plate VI., fig. 159). The body of these worms resembles that of the 

 typical form, though somewhat more slender ; 83 segments, length about 100 millims., 

 abdomen varicose, width of thorax 8'5 millims. The lateral lobes of the anterior 

 segments resemble the corresponding structures in L. annulijtlis (q. v.). 



Loimia montagui (Grube) Plate VI., figs. 160 to 163. 



Terebella montagui, Grube, ' Ann. Semp.,' 1878, p. 224. 



Loimia montagui, Marexzeli.er, ' Siidjapan. Ann.,' ii., 1884, p. 205. 



Not Terebella niontagni, Quatrefages, ' Hist. Nat. Ann.,' ii., 1865, p. 361. 



A large number of cylindrical worm tubes are labelled " No. 32, Terebella, Palk 

 Bay." Many of the tubes are in short lengths, the more complete measure upwards 

 of 100 millims. (4 inches) in length, with a diameter of 9 millims. They are coated 

 with a thick dense layer of fine mud presenting a smooth surface, the lips of the 

 terminal orifices approximated, so that no sign of the contained worm appears 

 externally. I found two worms only belonging to the tubes. 



