190 
Fig. 2. Galathealinum mexicanum Adegoke sp. 
nov. Paratype, ucmp 12155. Anterior region of para- 
type showing well-defined segments, coarse transverse 
fibers, and some encrusting calcareous annelid tubes, 
X 1.7. 
rather irregularly oriented, and a few are even 
confluent. The interior wall is a glossy, dark- 
brown color, and is devoid of the feltlike layer. 
Both the extreme anterior and posterior ends of 
the tubes are unknown. 
dimensions: Holotype : length 147.5 mm, di- 
ameter of wider anterior end 2.5 mm, diameter 
of smaller posterior end 2.2 mm, average length 
of segments 4.0 mm, thickness of wall 0.1 mm, 
thickness of coarse fibers 15-22p. Paratype: 
length 77.5 mm, diameter of wider anterior end 
2.4 mm, diameter of posterior end 1.96 mm, 
average length of segments 4.5 mm, thickness 
of wall about 0.1 mm, thickness of coarse fibers 
15— 22| x . 
holotype: Univ. Calif. Mus. Paleo, no. 
32882, locality B-7469. 
paratype: ucmp no. 12155, from type local- 
ity. 
PACIFIC SCIENCE, Vol. XXI, April 1967 
Fig. 3- Galathealinum mexicanum Adegoke sp. 
nov. Anterior end of holotype showing a few seg- 
ments with coarse fibers and remnants of segmental 
frills at the nodes, X 5. 
Fig. 4. Galathealinum mexicanum Adegoke sp. 
nov. Part of holotype enlarged to show irregular 
coarse fibers, X 5. 
occurrence: ucmp locality B-7469. Few 
tubes and some echinoids dredged by the Ver- 
million Sea Expedition S.I.O., from the Gulf 
of Tehuantepec, Mexico. Latitude 14°28 / N to 
14° 29'N. Longitude 93° 09'W to 93° 10'W. 
Depth 1,935-1,974 fathoms. Field no. P-128- 
58. 
remarks: Galathealinum mexicanum sp. 
nov. resembles other described species of Gala - 
thealinum in the possession of a dark-brown, 
segmented tube covered externally by a thin, fri- 
able, feltlike layer. Its dimensions are closest to 
